The Heliopan 46mm #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    46mm 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 46mm front filter threads permits combining with other filters.

Related Questions and Answers

Q: 1. Will this work with the Sigma A00090 Rear Filter Holder?

A: Hi--that filter holder is only compatible with two Sigma filters; it's not compatible with this filter.

Q: 2. Can this be used with lensbaby composer pro ii?

A: Yes, I use these macro filters with my Composer Pro II & the Sweet 50 Optic.

Q: 3. What is the difference between these and the extension kit that’s the same price?

A: Close up filters are easy to use, with no loss of light, but lose image quality, do not work well on wide angle lenses and you cannot focus at infinity. Extension tubes work well on wide to normal lenses and there is no lost in image quality. However, they do not work well on telephotos, you lose infinity, you lose light the longer they are, exposure can be trial and error, the build quality of the connection and any electronics can have an effect on usefulness.

Q: 4. will these fit the lensbaby soft focus lens?

A: This will not fit , for Macro photography consider this Lensbaby Macro Converter Extension Rings for Lensbaby B&H # LELMC MFR # LBMC

Q: 5. Will this fit on my spark 2.0 sweet 50?

A: Being that the Spark 2.0 with the Sweet 50 Optic has a front diameter of 46mm, this Macro Filter Kit is compatible.

Q: 6. Is this compatible with Sigma 500mm f/4 rear drop-in filter holder?

A: Yes, the NiSi 46mm Natural Night Filter should work with the Sigma 500mm f/4 DG OS HSM Sports Lens.

Q: 7. 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: 8. Is it double coated?

A: Hi Sorin, These are multi-coated filters!

Q: 9. Will this fit on my sweet 50 spark 2.0?

A: Yes it would , Lensbaby Spark 2.0 with Sweet 50 takes 46mm filters

Q: 10. Will this fit on the Sol 45mm?

A: Yes, the Sol 45 is a 46mm thread mount.