The Heliopan 30mm 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 30mm 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    30mm 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
• 30mm front filter threads allow for use with other filters
• Plastic case for storage and transport

Related Questions and Answers

Q: 1. Where does it made?

A: The lens itself has no markings indicating country of origin. The box says Made in Vietnam in four different languages. I presume this statement refers to the contents of the box.

Q: 2. may someone can tell me if this lens can work with AF on 645N II?

A: i think only pentax can answer this

Q: 3. Does this lens offer total manual control?

A: Yes this lens offers manual control.

Q: 4. can it be used with the 645Z body?

A: Yes, this lens will work on the 645z body

Q: 5. Wondering if this prime is noticeably sharper than the Fuji Gf 20-35?

A: Yes hte FUJIFILM GF 30mm f/3.5 R WR Lens is noticeably sharper than the 20-35mm zoom lens.

Q: 6. Will this lens work on the Pentax K-3 III?

A: Not directly, Pentax smc FA 645 400mm f/5.6 ED IF Lens has a Pentax 645 medium format native mount.Pentax K-3 Mark III DSLR Camera has a K-mount. You can use a lens adapter to connect Pentax 645 lenses to Pentax K-mount cameras. All the current adapters are strictly under full manual operations.

Q: 7. Will this take filters ??

A: Yes. It has standard 46 mm threads on the front.

Q: 8. Will this restock?

A: The Sigma 30mm f/1.4 DC DN Contemporary Lens for Sony E is currently in stock.

Q: 9. 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: 10. 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.