While somewhat useful to stills photographers, variable ND filters are an indispensable tool for filmmakers. This filter allows quick and easy manipulation of the exposure in order to achieve the desired aperture and shutterspeed when there is too much light. 

Variable ND filters are made by mounting two polarisers facing each other and when turned, they progressively cut out more and more light. This can achieve an exposure reduction ranging from 1.5-10x stops, so why is this filter limited to a maximum of 5x stops exposure reduction? The problem with the double-polariser approach is that beyond a certain range, the darkening becomes very uneven across the frame, resulting in what is known as the x-effect - see image x. This is why most commercial film productions still make use of conventional ND filter sets. 

A Variable ND filter does however still have a great place in the world if used within the limits of the x-effect, which is why NiSi have limited their offering from a 1.5x - 5.0x stop range. Compared to a conventional cinema ND filter set and matte box with filter trays, this filter costs about 5% of the price. It also offers instant manipulation of the exposure reduction by simply turning the filter and thanks to it's compact size it is much more friendly to DSLR and mirrorless filmmakers. 

This filter features NiSi's renowned scratch-resistant and hydrophobic nano coating, which ensures that it lasts and makes it quick and easy to clean. It also features a pin on the side that makes it easy to rotate from behind the camera. 

Is there any X-effect at 5 stops? 

If you set out to look for it, you will encounter a hint of the X-effect at 5 stops...if you use an ultra wide lens and you shoot against a clean background. Our staff have used this filter for countless video productions and we have been selling it for a year, without noticing the X-effect in any of our videos or receiving one complaint about it from a customer. So while you might find it if you really look for it, it simply doesn't show up in practical use. 

We offer three different UV filters from NiSi as well as a more modern alternative. Please read below to understand the difference between the products on offer -

UV filters eliminate the ultraviolet light, which we cannot see, but affects our images. One of the first issues to take note of is that the light we as humans see and that is critical to our images' colour capture is around 400-750nm. Anything below is considered UV and anything higher is considered IR.

Most camera's sensors can potentially see a massive spectrum, ranging from 200nm to 900nm, which contains a lot of light that is detrimental to the colour integrity of any photo. For this reason most cameras have an IR and UV filter that limit the range from around 250nm to 780nm. What remains between this range and the visible range can affect colour, but it is very seldom noticeable in images. It used to be a much bigger problem in the film days, when UV filters were considered a must-have accessory. One can't absolutely make the argument that UV filters serve no optical purpose in the digital age, as there are situations in which they do help as they cut out the range between the built-in filter and the visible spectrum; 280-395nm. Their real purpose lies in something much simpler - as a protective element for the lenses that cost us so much money. 

In the film days this was a secondary benefit to the filters, but with the advent of digital sensors and built-in UV filters their secondary property has become their primary purpose. NiSi offer three different UV filters, the primary difference being the material that the ring is made of. They also offer a filter that is the more modern approach to this situation - a protector filter, which features much stronger glass than the UV filters. If you truly just want to protect your lens, this is the one to go for. If you want to protect your lens and eliminate the 250-395nm light spectrum, then choose one of the UV's based on the below information. They are ordered by price. 

1. SMC UV (77mm = R699.00) - This filter features the same optics and water-repellant and scratch-resistant nano coating as the pricier models, but the compromise lies in the material the ring is made of - aluminium. This is the material that gets jammed in lens threads most easily and contracts and expands a lot in extreme temperatures. If you screw the filter on firmly without forcing it, there shouldn't be a problem, but if aluminium filters get stuck they can be a nightmare to get out. On the plus side, this is the thinnest of all the UV's and aluminium is a lot lighter than brass. 
2. PRO Nano HUC UV (77mm = R1 099.00) - All of NiSi's 'PRO Nano HUC' series filters feature a brass ring, which doesn't jam easily as it's a very malleable material. It is also more resistant to temperature changes, meaning it won't get stuck as easily in extreme temperatures. The downside is that brass is very heavy (3.5x times the density of aluminium).
3. Titanium Alloy UV (77mm = R2 099.00)- When it comes to metals, there are few that beat Titanium. It is stronger, lighter and more resistant to extreme temperatures than almost any other material. If you're the kind of person who doesn't compromise, then this filter is for you.

All NiSi circular filters feature their proprietary nano-coating that makes water bead like it does on a duck's back. This makes it extremely easy to keep them clean, especially in testing environments like the coast, in rainy conditions or when shooting near waterfalls. It also makes them scratch resistant, ensuring long years of use.

All NiSI circular filters ship with a hard plastic storage case. If you are purchasing multiple circular filters, the soft pouch is a great addition for quick, safe and easy transport, storage and access. 

The NiSi circular filter kits offer a wide variety of filter combinations at greatly discounted pricing compared to purchasing the filters individually.  

We offer three different UV filters from NiSi as well as a more modern alternative - a protector filter. Please read below to understand the difference between the products on offer -

UV filters eliminate the ultraviolet light, which we cannot see, but affects our images. One of the first issues to take note of is that the light we as humans see and that is critical to our images' colour capture is around 400-750nm. Anything below is considered UV and anything higher is considered IR.

Most camera's sensors can potentially see a massive spectrum, ranging from 200nm to 900nm, which contains a lot of light that is detrimental to the colour integrity of any photo. For this reason most cameras have an IR and UV filter that limit the range from around 250nm to 780nm. What remains between this range and the visible range can affect colour, but it is very seldom noticeable in images. It used to be a much bigger problem in the film days, when UV filters were considered a must-have accessory. One can't absolutely make the argument that UV filters serve no optical purpose in the digital age, as there are situations in which they do help as they cut out the range between the built-in filter and the visible spectrum; 280-395nm. Their real purpose lies in something much simpler - as a protective element for the lenses that cost us so much money. 

In the film days this was a secondary benefit to the filters, but with the advent of digital sensors and built-in UV filters their secondary property has become their primary purpose. NiSi offer three different UV filters, the primary difference being the material that the ring is made of. They also offer a filter that is the more modern approach to this situation - a protector filter, which features much stronger glass than the UV filters. If you truly just want to protect your lens, this is the one to go for. If you want to protect your lens and eliminate the 250-395nm light spectrum, then choose one of the UV's based on the below information. They are ordered by price. 

1. SMC UV (77mm = R699.00) - This filter features the same optics and water-repellant and scratch-resistant nano coating as the pricier models, but the compromise lies in the material the ring is made of - aluminium. This is the material that gets jammed in lens threads most easily and contracts and expands a lot in extreme temperatures. If you screw the filter on firmly without forcing it, there shouldn't be a problem, but if aluminium filters get stuck they can be a nightmare to get out. On the plus side, this is the thinnest of all the UV's and aluminium is a lot lighter than brass. 
2. Pro Nano HUC Protector Filter (77mm = R1 049.00) - This filter features the same nano-coatings and brass ring as the HUC UV, but instead of a UV cutting filter, it features super strong optical proglass that allows near perfect light transmission to protect your lens without interfering with the image quality. 
3. PRO Nano HUC UV (77mm = R1 099.00) - All of NiSi's 'PRO Nano HUC' series filters feature a brass ring, which doesn't jam easily as it's a very malleable material. It is also more resistant to temperature changes, meaning it won't get stuck as easily in extreme temperatures. The downside is that brass is very heavy (3.5x times the density of aluminium).
4. Titanium Alloy UV (77mm = R2 099.00)- When it comes to metals, there are few that beat Titanium. It is stronger, lighter and more resistant to extreme temperatures than almost any other material. If you're the kind of person who doesn't compromise, then this filter is for you.

All NiSi circular filters feature their proprietary nano-coating that makes water bead like it does on a duck's back. This makes it extremely easy to keep them clean, especially in testing environments like the coast, in rainy conditions or when shooting near waterfalls. It also makes them scratch resistant, ensuring long years of use.

All NiSI circular filters ship with a hard plastic storage case. If you are purchasing multiple circular filters, the soft pouch is a great addition for quick, safe and easy transport, storage and access. 

The NiSi circular filter kits offer a wide variety of filter combinations at greatly discounted pricing compared to purchasing the filters individually.  

When it comes to enhancing images, a circular polariser is probably the oldest trick in the book. It can change a pale sky to a deep blue one, turn foliage into a luminous super-green, light up autumn colours, saturate rainbows and even make water look crystal clear. The added contrast, saturation and clarity that a polariser can give to images is nothing short of magic and every photographer should have one in their bag.

Contrary to it's name, a polarising filter does not polarise light; it filters out polarised light. Light from the sun is polarised when it bounces off any non-metallic reflective surface like water, foliage or various air particulates. Polarised light robs images of colour, clarity and contrast and is in many situations undesirable. A polarising filter removes this 'damaged' light and ensures that only unpolarised light reaches the camera sensor to produce a sharp, saturated and contrast-rich image.

For this reason, a polarising filter is a very popular tool for any photographer, but especially for landscape photographers. 

NiSi's PRO Nano HUC polarisers are made from top of the range optical proglass, mounted in a brass ring and treated with a cutting edge water-repellant and scratch resistant nano coating. Brass threads don't jam nearly as easily aluminium. 

What is the difference between a linear and circular polariser? Digital cameras' AF systems are not compatible with linear polarisers. When the world was transitioning from film to digital, linear vs. circular was a big debate, but it no longer is. For photographic purposes, you can assume that any polariser on the market nowadays is circular and not linear. 

The NiSi natural night filter removes unwanted light pollution in night photos by cutting out very specific wavelengths of light produced by artificial light sources. It removes all yellow light produced by sodium-vapor lamps, mercury-vapor lamps and low-CRI LED's. This ensures that night-time images are colour-accurate, sharp and rich in contrast.

This unique new filter is an indespensible tool for any serious cityscape shooter. 

NiSi is renowned as one of the world's top manufacturers of completely colour-neutral and vignette-free ND filters. Made from H-K9L optical proglass, it allows optimal light transmission to produce sharp and contrast rich images with true-to-life colour. 

Solid neutral density filters lengthen exposure by cutting out a specific amount of light. This is very useful for creative purposes, whether you want to blur a wave, waterfall, leopard or a street scene. They are available in many different densities, ranging from 2 to 20 stops, but the most popular are 3-, 6- and 10-stops. Please read the bullet points below to understand the purpose of each. 

• 3-Stop | 0.9 - This filter is used to add a slight blur to water before the sun has set or after it has risen. At f/16 and ISO100, it is impossible to achieve a slow enough shutterspeed to get the ideal amount of blur in the waves while the sun is up. Three stops of darkening will normally allow a shutterspeed of 1/10s to 1/2s during this golden sunlight phase, producing soft lines in the waves. 
• 6-Stop | 1.8 - This filter serves the same purpose as the 10-stop, but it is better suited for sunset and sunrise. When the sun is close to setting or rising, a 10-stop ND will require a very long shutterspeed at f/11-16 and ISO100 to produce the correct exposure - often as much as 5-10 minutes. A 6-stop ND is thus much more suited for capturing long exposures of 30-60s around sunset and sunrise. 
• 10-Stop | 3.0 - This filter is used primarily for blurring the sea to a flat mist and for blurring clouds into abstract lines. It can also be used to remove traffic and people from urban scenes by blurring the moving elements. At f/11-16 and ISO100, it usually produces a shutterspeed of 20-30s in early morning or late afternoon with strong sunlight.
• 15-Stop | 4.5 - This filter is serious long exposure territory and will produce exposures times of 1-4 minutes in peak daylight and 5-30 minutes during golden hour. 

IR Blocking - This filter blocks out unwanted Infra-red light that can cause strange colours in undesired areas and rob images of critical shadow-contrast.

Nano Coating - This filter features a super tough scratch-resistant and hydrophobic nano coating that ensures that it lasts for years. It also ensures that any rain or spray from the ocean beads properly and is easy to wipe off so you can continue shooting the sunset.

Is this a Variable ND? - No, rotating the polarizer component of the filter has no effect on the density. We believe that this is a 1.2 ND combined with a CPL. 

We offer three different UV filters from NiSi as well as a more modern alternative. Please read below to understand the difference between the products on offer -

UV filters eliminate the ultraviolet light, which we cannot see, but affects our images. One of the first issues to take note of is that the light we as humans see and that is critical to our images' colour capture is around 400-750nm. Anything below is considered UV and anything higher is considered IR.

Most camera's sensors can potentially see a massive spectrum, ranging from 200nm to 900nm, which contains a lot of light that is detrimental to the colour integrity of any photo. For this reason most cameras have an IR and UV filter that limit the range from around 250nm to 780nm. What remains between this range and the visible range can affect colour, but it is very seldom noticeable in images. It used to be a much bigger problem in the film days, when UV filters were considered a must-have accessory. One can't absolutely make the argument that UV filters serve no optical purpose in the digital age, as there are situations in which they do help as they cut out the range between the built-in filter and the visible spectrum; 280-395nm. Their real purpose lies in something much simpler - as a protective element for the lenses that cost us so much money.

In the film days this was a secondary benefit to the filters, but with the advent of digital sensors and built-in UV filters their secondary property has become their primary purpose. NiSi offer three different UV filters, the primary difference being the material that the ring is made of. They also offer a filter that is the more modern approach to this situation - a protector filter, which features much stronger glass than the UV filters. If you truly just want to protect your lens, this is the one to go for. If you want to protect your lens and eliminate the 250-395nm light spectrum, then choose one of the UV's based on the below information. They are ordered by price. 

1. SMC UV (77mm = R699.00) - This filter features the same optics and water-repellant and scratch-resistant nano coating as the pricier models, but the compromise lies in the material the ring is made of - aluminium. This is the material that gets jammed in lens threads most easily and contracts and expands a lot in extreme temperatures. If you screw the filter on firmly without forcing it, there shouldn't be a problem, but if aluminium filters get stuck they can be a nightmare to get out. On the plus side, this is the thinnest of all the UV's and aluminium is a lot lighter than brass. 
2. PRO Nano HUC UV (77mm = R1 099.00) - All of NiSi's 'PRO Nano HUC' series filters feature a brass ring, which doesn't jam easily as it's a very malleable material. It is also more resistant to temperature changes, meaning it won't get stuck as easily in extreme temperatures. The downside is that brass is very heavy (3.5x times the density of aluminium).
3. Titanium Alloy UV (77mm = R2 099.00)- When it comes to metals, there are few that beat Titanium. It is stronger, lighter and more resistant to extreme temperatures than almost any other material. If you're the kind of person who doesn't compromise, then this filter is for you.

All NiSi circular filters feature their proprietary nano-coating that makes water bead like it does on a duck's back. This makes it extremely easy to keep them clean, especially in testing environments like the coast, in rainy conditions or when shooting near waterfalls. It also makes them scratch resistant, ensuring long years of use.

All NiSI circular filters ship with a hard plastic storage case. If you are purchasing multiple circular filters, the soft pouch is a great addition for quick, safe and easy transport, storage and access. 

The NiSi circular filter kits offer a wide variety of filter combinations at greatly discounted pricing compared to purchasing the filters individually.  

NiSi is renowned as one of the world's top manufacturers of completely colour-neutral and vignette-free ND filters. Made from H-K9L optical proglass, it allows optimal light transmission to produce sharp and contrast rich images with true-to-life colour. 

Solid neutral density filters lengthen exposure by cutting out a specific amount of light. This is very useful for creative purposes, whether you want to blur a wave, waterfall, leopard or a street scene. They are available in many different densities, ranging from 2 to 20 stops, but the most popular are 3-, 6- and 10-stops. Please read the bullet points below to understand the purpose of each. 

• 3-Stop | 0.9 - This filter is used to add a slight blur to water before the sun has set or after it has risen. At f/16 and ISO100, it is impossible to achieve a slow enough shutterspeed to get the ideal amount of blur in the waves while the sun is up. Three stops of darkening will normally allow a shutterspeed of 1/10s to 1/2s during this golden sunlight phase, producing soft lines in the waves. 
• 6-Stop | 1.8 - This filter serves the same purpose as the 10-stop, but it is better suited for sunset and sunrise. When the sun is close to setting or rising, a 10-stop ND will require a very long shutterspeed at f/11-16 and ISO100 to produce the correct exposure - often as much as 5-10 minutes. A 6-stop ND is thus much more suited for capturing long exposures of 30-60s around sunset and sunrise. 
• 10-Stop | 3.0 - This filter is used primarily for blurring the sea to a flat mist and for blurring clouds into abstract lines. It can also be used to remove traffic and people from urban scenes by blurring the moving elements. At f/11-16 and ISO100, it usually produces a shutterspeed of 20-30s in early morning or late afternoon with strong sunlight.
• 15-Stop | 4.5 - This filter is serious long exposure territory and will produce exposures times of 1-4 minutes in peak daylight and 5-30 minutes during golden hour. 

IR Blocking - This filter blocks out unwanted Infra-red light that can cause strange colours in undesired areas and rob images of critical shadow-contrast.

Nano Coating - This filter features a super tough scratch-resistant and hydrophobic nano coating that ensures that it lasts for years. It also ensures that any rain or spray from the ocean beads properly and is easy to wipe off so you can continue shooting the sunset.

The NiSi Circular Filter Pouch for 4 Filters is designed for any circular filters up to 95mm. It can be conveniently mounted on a tripod leg for easy access and use and is designed from a lightweight material that protects your filters.  The pouch can hold up to 4 filters a features filter slots that keep each individual filters safe and prevent them from scratching in the pouch.

Also compatible to hold 4 x 100x100mm filters.

• Hold up to 4 circular filters (up to 95mm)
• Lightweight design
• Can be mounted to a tripod for easy access and use
• Compact and lightweight
• Fits easily in your camera bag

We offer three different UV filters from NiSi as well as a more modern alternative. Please read below to understand the difference between the products on offer -

UV filters eliminate the ultraviolet light, which we cannot see, but affects our images. One of the first issues to take note of is that the light we as humans see and that is critical to our images' colour capture is around 400-750nm. Anything below is considered UV and anything higher is considered IR.

Most camera's sensors can potentially see a massive spectrum, ranging from 200nm to 900nm, which contains a lot of light that is detrimental to the colour integrity of any photo. For this reason most cameras have an IR and UV filter that limit the range from around 250nm to 780nm. What remains between this range and the visible range can affect colour, but it is very seldom noticeable in images. It used to be a much bigger problem in the film days, when UV filters were considered a must-have accessory. One can't absolutely make the argument that UV filters serve no optical purpose in the digital age, as there are situations in which they do help as they cut out the range between the built-in filter and the visible spectrum; 280-395nm. Their real purpose lies in something much simpler - as a protective element for the lenses that cost us so much money. 

In the film days this was a secondary benefit to the filters, but with the advent of digital sensors and built-in UV filters their secondary property has become their primary purpose. NiSi offer three different UV filters, the primary difference being the material that the ring is made of. They also offer a filter that is the more modern approach to this situation - a protector filter, which features much stronger glass than the UV filters. If you truly just want to protect your lens, this is the one to go for. If you want to protect your lens and eliminate the 250-395nm light spectrum, then choose one of the UV's based on the below information. They are ordered by price. 

1. SMC UV (77mm = R699.00) - This filter features the same optics and water-repellant and scratch-resistant nano coating as the pricier models, but the compromise lies in the material the ring is made of - aluminium. This is the material that gets jammed in lens threads most easily and contracts and expands a lot in extreme temperatures. If you screw the filter on firmly without forcing it, there shouldn't be a problem, but if aluminium filters get stuck they can be a nightmare to get out. On the plus side, this is the thinnest of all the UV's and aluminium is a lot lighter than brass. 
2. PRO Nano HUC UV (77mm = R1 099.00) - All of NiSi's 'PRO Nano HUC' series filters feature a brass ring, which doesn't jam easily as it's a very malleable material. It is also more resistant to temperature changes, meaning it won't get stuck as easily in extreme temperatures. The downside is that brass is very heavy (3.5x times the density of aluminium).
3. Titanium Alloy UV (77mm = R2 099.00)- When it comes to metals, there are few that beat Titanium. It is stronger, lighter and more resistant to extreme temperatures than almost any other material. If you're the kind of person who doesn't compromise, then this filter is for you.

All NiSi circular filters feature their proprietary nano-coating that makes water bead like it does on a duck's back. This makes it extremely easy to keep them clean, especially in testing environments like the coast, in rainy conditions or when shooting near waterfalls. It also makes them scratch resistant, ensuring long years of use.

All NiSI circular filters ship with a hard plastic storage case. If you are purchasing multiple circular filters, the soft pouch is a great addition for quick, safe and easy transport, storage and access. 

The NiSi circular filter kits offer a wide variety of filter combinations at greatly discounted pricing compared to purchasing the filters individually.  

This filter features two key differences from the PRO nano HUC version.

1. The ring is made from a titanium alloy and is thus stronger, lighter and less likely to get jammed in a lens thread. 
2. The popularity of the Landscape Enhanced polariser first made for the V5/100mm system has resulted in a circular version being brought to market. What's the difference? It has a stronger effect and a slightly cool tone. This filter works miracles for seascapes and scenes with water as it reveals more of the water by cutting through the surface reflections and it also ensures that all the whites in waves and cascades are a beautiful crisp, cool white. 

When it comes to enhancing images, a circular polariser is probably the oldest trick in the book. It can change a pale sky to a deep blue one, turn foliage into a luminous super-green, light up autumn colours, saturate rainbows and even make water look crystal clear. The added contrast, saturation and clarity that a polariser can give to images is nothing short of magic and every photographer should have one in their bag.

Contrary to it's name, a polarising filter does not polarise light; it filters out polarised light. Light from the sun is polarised when it bounces off any non-metallic reflective surface like water, foliage or various air particulates. Polarised light robs images of colour, clarity and contrast and is in many situations undesirable. A polarising filter removes this 'damaged' light and ensures that only unpolarised light reaches the camera sensor to produce a sharp, saturated and contrast-rich image.

For this reason, a polarising filter is a very popular tool for any photographer, but especially for landscape photographers. 

NiSi's PRO Nano HUC polarisers are made from top of the range optical proglass, mounted in a titanium alloy ring and treated with a cutting edge water-repellant and scratch resistant nano coating. Brass threads don't jam nearly as easily aluminium. 

What is the difference between a linear and circular polariser? Digital cameras' AF systems are not compatible with linear polarisers. When the world was transitioning from film to digital, linear vs. circular was a big debate, but it no longer is. For photographic purposes, you can assume that any polariser on the market nowadays is circular and not linear. 

NiSi is renowned as one of the world's top manufacturers of completely colour-neutral and vignette-free ND filters. Made from H-K9L optical proglass, it allows optimal light transmission to produce sharp and contrast rich images with true-to-life colour. 

Solid neutral density filters lengthen exposure by cutting out a specific amount of light. This is very useful for creative purposes, whether you want to blur a wave, waterfall, leopard or a street scene. They are available in many different densities, ranging from 2 to 20 stops, but the most popular are 3-, 6- and 10-stops. Please read the bullet points below to understand the purpose of each. 

• 3-Stop | 0.9 - This filter is used to add a slight blur to water before the sun has set or after it has risen. At f/16 and ISO100, it is impossible to achieve a slow enough shutterspeed to get the ideal amount of blur in the waves while the sun is up. Three stops of darkening will normally allow a shutterspeed of 1/10s to 1/2s during this golden sunlight phase, producing soft lines in the waves. 
• 6-Stop | 1.8 - This filter serves the same purpose as the 10-stop, but it is better suited for sunset and sunrise. When the sun is close to setting or rising, a 10-stop ND will require a very long shutterspeed at f/11-16 and ISO100 to produce the correct exposure - often as much as 5-10 minutes. A 6-stop ND is thus much more suited for capturing long exposures of 30-60s around sunset and sunrise. 
• 10-Stop | 3.0 - This filter is used primarily for blurring the sea to a flat mist and for blurring clouds into abstract lines. It can also be used to remove traffic and people from urban scenes by blurring the moving elements. At f/11-16 and ISO100, it usually produces a shutterspeed of 20-30s in early morning or late afternoon with strong sunlight.
• 15-Stop | 4.5 - This filter is serious long exposure territory and will produce exposures times of 1-4 minutes in peak daylight and 5-30 minutes during golden hour. 

IR Blocking - This filter blocks out unwanted Infra-red light that can cause strange colours in undesired areas and rob images of critical shadow-contrast.

Nano Coating - This filter features a super tough scratch-resistant and hydrophobic nano coating that ensures that it lasts for years. It also ensures that any rain or spray from the ocean beads properly and is easy to wipe off so you can continue shooting the sunset.

NiSi is renowned as one of the world's top manufacturers of completely colour-neutral and vignette-free ND filters. Made from H-K9L optical proglass, it allows optimal light transmission to produce sharp and contrast rich images with true-to-life colour. 

Solid neutral density filters lengthen exposure by cutting out a specific amount of light. This is very useful for creative purposes, whether you want to blur a wave, waterfall, leopard or a street scene. They are available in many different densities, ranging from 2 to 20 stops, but the most popular are 3-, 6- and 10-stops. Please read the bullet points below to understand the purpose of each. 

• 3-Stop | 0.9 - This filter is used to add a slight blur to water before the sun has set or after it has risen. At f/16 and ISO100, it is impossible to achieve a slow enough shutterspeed to get the ideal amount of blur in the waves while the sun is up. Three stops of darkening will normally allow a shutterspeed of 1/10s to 1/2s during this golden sunlight phase, producing soft lines in the waves. 
• 6-Stop | 1.8 - This filter serves the same purpose as the 10-stop, but it is better suited for sunset and sunrise. When the sun is close to setting or rising, a 10-stop ND will require a very long shutterspeed at f/11-16 and ISO100 to produce the correct exposure - often as much as 5-10 minutes. A 6-stop ND is thus much more suited for capturing long exposures of 30-60s around sunset and sunrise. 
• 10-Stop | 3.0 - This filter is used primarily for blurring the sea to a flat mist and for blurring clouds into abstract lines. It can also be used to remove traffic and people from urban scenes by blurring the moving elements. At f/11-16 and ISO100, it usually produces a shutterspeed of 20-30s in early morning or late afternoon with strong sunlight.
• 15-Stop | 4.5 - This filter is serious long exposure territory and will produce exposures times of 1-4 minutes in peak daylight and 5-30 minutes during golden hour. 

IR Blocking - This filter blocks out unwanted Infra-red light that can cause strange colours in undesired areas and rob images of critical shadow-contrast.

Nano Coating - This filter features a super tough scratch-resistant and hydrophobic nano coating that ensures that it lasts for years. It also ensures that any rain or spray from the ocean beads properly and is easy to wipe off so you can continue shooting the sunset.