The Heliopan 28mm RG 610 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 28mm RG 610 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 90% of infrared light waves 610nm 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    90% of IR 610nm or Above Can Pass    Blocks Near-IR, Visible, and UV Light    ~8x Filter Factor, ~3 Stops    Schott Glass Construction    Multi-Coated    28mm 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 90% of infrared light waves beginning at 610nm to pass through
• Effective for infrared films or other media sensitive to infrared wavelengths 610nm 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 8x reduces exposure by about 3 stops
• Thin, brass filter ring helps to prevent vignetting, jamming, and provides additional strength
• 28mm front filter threads allow for use with other filters
• Plastic case for storage and transport

Related Questions and Answers

Q: 1. How fast is the auto focus when shooting video on the As7ii? I want to use this lens on a gimbal so need pretty good auto focus.

A: We know of no issues regarding the focus on this lens.

Q: 2. How good is this lens for video on Sony A6000, given that it does not have optical image stabilisation?

A: The build quality and picture/video quality is amazing. Because the a6000 is a crop sensor, this 28mm acts as a 42mm equivalent. On a tripod or in steady hands the lens is fine. If you're running around (with any lens) with no stabilization, you will produce a shaky image. Another thing to consider is the digital accelerated focus ring. If you will be using this on a rig with a follow focus system, keep shopping. This focus system makes it nearly impossible to do rack focusing or replicate a previous shot. To recap: on a tripod or in steady hands shooting mostly still subjects, this lens produces a wonderful image but, for other video purposes I would not recommend this lens.

Q: 3. How quiet is the lens when focusing? Can you hear it in a silent room or on the microphone?

A: This makes very little noise when focusing. It may be picked by the microphone or heard in a silent room, but it is very close to being silent.

Q: 4. What is the material of the lenses? Glass or plastic?

A: The body is metal, the hood is plastic and the lens is glass. It's a very solid build and it's a sharp lens.

Q: 5. How is this lens for astrophotography?

A: Great lens, very sharp. But most people prefer to have wider than 28mm for astrophotography.

Q: 6. Is the focusing/aperture action on the FE 28/2 louder than other FE lenses? Or is this unique to the used copy I just purchased? Focusing at f2.0, my copy is surprisingly loud with a bit of vibration/roughness. Its similar to screw drive lenses. Considerably less stealth than any of the other FE lenses I've used (55/1.8, 90/2.8, 28-70 kit). I'm considering returning it, but wonder if another (new) copy would be similar. Others have a similar impression? Any thoughts appreciated.

A: I just tested mine and it is nearly silent - certainly no louder than my 35 or 55, in fact a touch quieter than the 35, but all are very quiet.

Q: 7. How is the corner sharpness on this lens? And the ultrawide 21mm converter? I've seen mixed reviews.

A: I have been surprised by the quality on this lens - I may have a good copy, but corners have been fine for me. Distortion has been easy to fix (no profile in Adobe raw that I have seen). Build quality and overall rendering are a touch behind the zeiss branded 35 and 55. I have not tried to converter.

Q: 8. How does this lens stack up against the Zeiss Batis 25mm F2?

A: I own both and comparing (on an a7RII) same size images @f2.8 at 50% enlargements on screen the differences in sharpness really don't differ much for general use. Distortion and CA are different however. I have also found a lot of variation in the Sony lenses I have had, even with GM lenses so test yours while you can still exchange it at B

Q: 9. Does the lens come with a lens shade?

A: Noo mine didnt

Q: 10. Does this lens come with a lens hood? I do not see it listed, nor is it an option.

A: Yes it does, a little bayonet mount petal hood.