The Heliopan 55mm RG 850 Infrared Filter is designed to help capture images of how a subject reflects or transmits infrared light.

Infrared light waves occupy the space in the electromagnetic spectrum behind visible light due to their longer wavelengths. Many surfaces and materials react to, or emit infrared light waves differently than visible light waves, which provide the potential for photographs of subjects or subject properties that are otherwise invisible to the human eye. Such images require an infrared-sensitive medium such as infrared film or a digital photographic sensor which may be more effective when used without the infrared-blocking filters that are frequently built over them.

Conventional light sources such as the sun, photographic strobes, or incandescent lighting may be used to provide infrared illumination. However, because infrared films or digital photographic sensors can be more sensitive to the relatively higher energy and shorter-wavelength visible light those sources also emit, the effects of infrared light can be otherwise obscured. The Heliopan 55mm RG 850 Infrared Filter makes it possible to capture images of how subjects are illuminated by infrared light by blocking near-infrared, visible, and ultraviolet light waves while allowing approximately 85% of infrared light waves 850nm or greater into the lens it is mounted onto.

This filter is constructed from Schott glass for increased optical clarity and features a thin brass filter ring to minimize the potential for vignetting while enhancing durability and jamming prevention.

For Infrared Images    ~85% of IR 850nm or Above Can Pass    Blocks Near-IR, Visible, and UV Light    ~200x Filter Factor, ~7.6 Stops    Schott Glass Construction    Multi-Coated    55mm Front Filter Threads    Thin, Brass Filter Ring    Plastic Case

• Designed for use with infrared film or digital camera sensors by filtering out near-infrared, visible, and ultraviolet light
• Allows approximately 85% of infrared light waves beginning at 850nm to pass through
• Effective for infrared films or other media sensitive to infrared wavelengths 850nm or above
• Constructed from Schott glass for optical clarity
• Each glass surface includes four layers of anti-reflection coating to prevent internal ghosting and reflections
• Filter factor of approximately 200x reduces exposure by about 7.6 stops
• Thin, brass filter ring helps to prevent vignetting, jamming, and provides additional strength
• 55mm front filter threads allow for use with other filters
• Plastic case for storage and transport

Related Questions and Answers

Q: 1. Will this lens automatically start focusing in video mode without halfway pushing down the shutter button? Thanks!

A: as long as the AF is not set to manual, the AF function continues to operate while in video recording mode.

Q: 2. is it compatible with canon 550D?

A: Yes

Q: 3. I own a C100 and i am considering the 17-55 2.8 for hand held video - I also own a 24-70 2.8 that i use for photography (brilliant lens for stills) but, i have read the 17-55 2.8 has better image quality then the 24-70 2.8 because the 17-55 2.8 was built for crop sensor - has anyone experienced this? Thanks.

A: I am very happy with this lens for stills and video an my 70 D. Couldn't ask for any more sharpness than it provides.

Q: 4. How much does this lens weigh?

A: Weight (Approx.) : 10 oz. (281g)

Q: 5. Is there any reason why this lens wouldn't be awesome or photographing the Northern Lights in AK?

A: This is my primary lens, from portraits, landscapes or street. For Northern Lights? That is IT! for sure

Q: 6. Will this Lens work on a Canon EOS Rebel T1i / EOS 500D?

A: Yes.

Q: 7. Is this lens compatible with Sony 99

A: No. Need to use full-frame A-mount lenses.

Q: 8. Can the lens be auto-focused when the lens hood is reversed and is in the storage/transport position?

A: Yes, auto focus works with the lens hood reversed but manual focus is difficult unless you use it or remove the hood completely. By the way, I think this lens takes phenomenal photos!

Q: 9. How's this lens compared to the 50mm 1.4? Price factor is Alot.. (Using on Sony a7rii)

A: The 50 gives a bit more contrast and is a touch sharper, You also get the on lens AF switch and aperture.However. I'm a huge fan of the 55, it just feels right on the camera, my issue with a lot of glass on the A7 series is that it can feel too big. the 55 is small and light and an amazing performer.

Q: 10. Does this lens suffer from "focus breathing" when pulling focus in video applications?

A: Yes, the Sony Sonnar T* FE 55mm f/1.8 ZA Lens would show focus breathing. Moreover, the Sony Sonnar T* FE 55mm f/1.8 ZA Lens does not seem to be a lens supported by the focus compensation feature, which is built into many Sony camera models. See the following link for focus breathing compensation cameras and supported lenses: https://bhpho.to/3XCcqC5.