The Heliopan 40.5mm #29 Dark Red Filter is a basic contrast filter, primarily for use with black and white film, that completely absorbs blue and green tones, enhances reds, and increases contrast for outdoor photography. It is suitable for use in tri-color separations and for photographing faded documents. There is an approximate 8-12x filter factor with this filter, requiring an increase of 3 to 3.5 stops for normal exposure.

The front and rear surfaces of the filter both feature a single anti-reflection coating. Each coating helps to increase light transmission by reducing reflections, scattered light, and ghosting. Additionally, they offer protection to the filter substrate while helping to keep the glass clean for longer than uncoated glass.

This Heliopan filter is constructed from Schott glass for increased optical clarity and color fidelity. It features a brass filter ring for durability as well as jamming prevention.

#29 Filter for Enhanced B&W Contrast    8-12x Filter Factor, +3-3.5 Stops    40.5mm Front Filter Threads    Front and Rear Coating    Schott Glass Construction    Brass Filter Ring

Dark red contrast filter for black and white film significantly darkens blue and green tones, cuts through haze, and increases overall contrast.

Suitable for tri-color separations as well as reproduction photography of faded documents.

Single coatings on both the front and rear offer protection to the glass and help to improve light transmission and image quality.

Constructed from Schott glass for optical clarity.

Brass filter ring helps to prevent jamming and provides additional strength.

Dual threading with 40.5mm front filter threads permits combining with other filters.

Related Questions and Answers

Q: 1. All of my filters are for 1.25 mm . My camera is a Canon T3 Rebel . Will this filter fit in my lenses (1.25 mm) or on my camera?

A: The Heliopan 30mm RG 1000 Infrared Filter will fit a lens with a 30mm diameter front

Q: 2. Hello! is the holder ring provided with this filter? I need to fit this filter on a 52mm thread lens

A: The Heliopan Series 8 Infrared RG 850 Filter listed above is designed for usage on lenses that have a Series 8 bayonet filter mount. We have no lens mount adapters that would be compatible to connect this filter onto a lens that uses 52mm filter threads. If you own a lens with 52mm filter threads, I would instead recommend the Heliopan 52mm RG 850 Infrared Filter, B&H # HEIR85052, for your usage needs.

Q: 3. How is the 'protection' capability of this lens, if I'm looking to replace my protection/UV filters with this one? And does it have 8 coatings, or one on each side? I've heard conflicting descriptions.

A: The filter has one coating per side to help with reflections and protection of the glass.

Q: 4. Will 4x4 filters that are 4mm thick fit into the dividers?

A: Yes, the dividers will hold 4x4 or 4x6 filters.

Q: 5. how many f-stops do you need to adjust for using this filter? Also, what is the filter factor?

A: The B+W #630/091 Dark Red MRC Basic Filter has a 3 stop filter factor.

Q: 6. Thanks! Another qq. When the blue light filter is set to max, will it fully eliminate the blue light and show a yellow hue?

A: The ASUS VP299CL 29" HDR Monitor's blue light filter will significantly reduce blue light, creating an orange tint, but it will not eliminate it completely.

Q: 7. Does it work for 4x4 and 4x5.6 filters and the Nisi mattebox?

A: Yes, this will hold up to 4x5.56 filters as well as the Nisi filter holder.

Q: 8. What size in millimetres is Series 7 or 8?

A: The diameter of this Heliopan Series 8 Infrared RG 715 (88A) Filter is 63.5mm, but this filter does lack threading.

Q: 9. So, does this Digital Filter pretty much an even higher quality, more affective UV Filter?

A: Filters are made of the filter material, the glass it is in, the glass coatings and the metal ring. The higher the cost, the higher the quality of all materials and the better the optical result. After a point, however, it is like cars where you can get a comfortable Ford Focus (like Hoya) or a luxury BMW (like Heliopan.)

Q: 10. Why the pocket is half covered ? Is it like that or just for commercial ? If it true isn't The filter is exposed not totally safe might get scratch ?

A: The pockets for the circular filters in the Lowepro GearUp Filter Pouch 100 (Dark Gray) do not go all the way to the top. Larger filters will be somewhat exposed. The benefit is it makes them easier to access.