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.
- 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.
- 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).
- 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.