The Heliopan 48mm RG 645 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 48mm RG 645 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 645nm 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 645nm or Above Can Pass    Blocks Near-IR, Visible, and UV Light    ~8x Filter Factor, ~3 Stops    Schott Glass Construction    Multi-Coated    48mm 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 645nm to pass through
• Effective for infrared films or other media sensitive to infrared wavelengths 645nm 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
• 48mm front filter threads allow for use with other filters
• Plastic case for storage and transport

Related Questions and Answers

Q: 1. Does this lens offer total manual control?

A: Yes this lens offers manual control.

Q: 2. Does this lens work with a Pentax 645n camera?

A: Unfortunately no, the Pentax D FA 645 55mm lens was made for a 44x33mm image sensor which is smaller than 60x45mm film that is used in the 645N. The lens will not spread the light over the entire film plane in the 645N and would result in vignetting.

Q: 3. Is this lens compatible w/ the Hasselblad 907x ?

A: Pentax 645 mount is not compatible with the Hasselblad 907x without an adapter. To fit on the 907x without an adapter the lens needs to have a Hasselblad X mount.

Q: 4. may someone can tell me if this lens can work with AF on 645N II?

A: i think only pentax can answer this

Q: 5. Hello,I would like to know how this lens performs. Being that there is no review yet, the only thing left to do is ask for your help. I will use this for the Pentax 645z that will be bought this week at your store alongside the 55mm. Is the IQ any good? It is not cheap, but half the price of the new 28-45. Is there any huge gap between the two?Thank you :)

A: The Pentax 33-55 will give you excellent image quality, with 11 elements and 8 groups, using low dispersion glass. It will give you smooth out of focus areas, with an 8 blade aperture diaphragm.

Q: 6. Is this lens still made with the turned stainless steel mount as shown in this ad or is it the cheaper thin steel wafer as used on most of the other current 645 lenses?

A: Pentax-D FA 645 55mm f/2.8 AL[IF] SDM AW Lens has the Pentax classic turned stainless steel mount.

Q: 7. Does this fit the 645 pro TL?

A: The Arca-Swiss Monoball Classic System L-Bracket Camera Plate for Mamiya/PhaseOne 645 is not compatible with the Mamiya 645 Pro TL camera.

Q: 8. does it come with the np-60 battery charger?

A: The Vello FreeWave Viewer VL Wireless Live View Remote includes an AC USB wall adapter and a USB cable. The batteries are charged while in the unit. The transmitter and receiver are charged separately.

Q: 9. Would this work with a D5600?

A: This device is not compatible with the D5600.