The Formatt Hitech 82mm UV Filter -20is an underwater filter that is designed to absorb ultraviolet light and improve color accuracy at depths of 59'.0 to 65.6'.

Due to its density, water naturally attenuates radiation, including visible light. Lower-energy wavelengths of visible light that are apparent as red, orange, and yellow colors are attenuated more than higher-energy wavelengths of visible light that are apparent as blue, indigo, and violet colors. This further obscures the ability to see red to yellow hues, and can otherwise limit underwater life or objects to appearing only in shades of blue to violet.

Additionally, particles suspended underwater can reflect and scatter ambient sunlight. When this occurs, higher-energy wavelengths within sunlight such as ultraviolet light and visible light that are apparent as violet and blue colors are more easily reflected than lower-energy wavelengths of visible light that are apparent as yellow, orange, and red colors. Together, these particles, along with the ultraviolet, violet, and blue light they are reflecting can obscure details within a scene while further imparting an unwanted bluish cast.

The Formatt Hitech 82mm -20 UV Filter can help improve the results of underwater images at depths of 59'.0 to 65.6' by effectively absorbing ultraviolet light and reducing visible light that appears as blue and violet. Available red, orange, and yellow light is allowed into an underwater housing and camera, helping to improve color balance throughout the frame.

This filter is constructed from Schott B270 glass for increased optical clarity as well as color fidelity and features an aluminum-alloy filter ring for durability while remaining lightweight. When used, the Formatt Hitech 82mm -20 UV Filter's 0.1 density darkens the entire image by 0.3 stops. This reduction in exposure can be compensated for by adjusting the aperture setting of the lens it is placed on, or the shutter speed of the camera being used.

Underwater UV Filter    Helps Balance Underwater Ambient Light    For Depths of 59'.0 to 65.6'    1.25x Filter Factor, +0.3 Stop    Schott B270 Glass Construction    Non-Coated    Aluminum-Alloy Filter Ring    Plastic Case

• Designed to absorb ultraviolet light and improve the color accuracy of underwater images at depths of 59'.0 to 65.6'
• Helps balance levels of visible light while photographing in green or blue-colored, fresh water or salt water
• Reduces the appearance of visible violet and blue light while allowing available red, orange, and yellow colors into an underwater housing and camera
• 1.25x filter factor reduces exposure by 0.3 stop
• Filter density can be compensated for by adjusting lens aperture or camera shutter speed
• Constructed from Schott B270 Glass for optical clarity
• Non-coated
• Aluminum-alloy filter ring for durability while remaining lightweight
• Knurled front edges provide a more textured grip when mounting or removing it from a lens
• Plastic case included for storage and transport

Related Questions and Answers

Q: 1. Can I use this circular filter placed on my lens and carry on a mattebox with square ND filters to avoid IR input? Or will it be better to buy square IRND filters for mattebox? I have little budget and I don't know what a better option.

A: If the mattebox fits on the camera lens with filter in place you could do it that way.

Q: 2. will ZEISS 49 mm filter fit my SONY ALPHA 6000 ?

A: This filter fits lens not the camera itself.If your lens has 49mm filter thread it will fitI use this filter with my Sony Zeiss 24mm lensEnter an answer to this question.

Q: 3. Can this filter be used on Hasselblad XCD 28mm F4 or XCD 90mm f2.5 and still use lens cap and lens hood?

A: The ZEISS 72mm Carl ZEISS T* UV Filter has 72mm front filter threads, so it will work with a 72mm lens cap. It should also allow the lens hood to fit the lens.

Q: 4. What is the thickness of these filters in MM?

A: The ring on the ZEISS 46mm Carl ZEISS T* UV Filter is 4mm thick.

Q: 5. Is the filter ring deep enough to accommodate the RX1 clip-on lens cap?

A: You'll be able to put a lens cap on with this filter attached.

Q: 6. Does the filter have an outside thread?

A: Yes, this filter does have outside threads.

Q: 7. Hi will this work ok with the zoom lens on the sony fdr-ax700 handycam..?

A: The filter will work, just make sure the thread is the correct size.

Q: 8. will this filter fit the filter adapter for the Sony RX100M3 camera?

A: Unfortunately, there is currently no filter adapter for the Sony Cybershot RX100 III Digital Camera. Sony does manufacture the Sony VFA-49R1 49mm Filter Adapter, which is compatible with the original RX100 and RX100 II, but Sony states the adapter is not compatible with the RX100 III Digital camera, and does not list an alternative option on their website for your camera. I apologize for the inconvenience.

Q: 9. Hello. Will this work with hood and lens cap that come on a G Master 24mmF1.4?

A: Yes it will

Q: 10. Can an additional filter be attached to this one? For example Helix series.

A: The PolarPro 77mm QuartzLine UV Filter has a front thread of 82mm.