This 2" 9nm O-III Super-G CMOS Filter from Alpine Astronomical is designed for observing and photographing planetary nebulae, supernova remnants, and many large emission nebulae. Its 9nm FWHM and CMOS-optimized coatings deliver high visual contrast against the sky background and a 97% transmission rate for the emission line at 500.7nm. The filter can be used photographically from f/1.8 to f/12 without passing any light of the H-beta line, making it ideal for areas with high light pollution. The mounted filter features a Reflex-Blocker hard coating, plano-optical polishing, and Life-Coat sealed edges.

9nm FWHM, Max Transmission 97%    For Planetary Nebulae/Supernova Remnants    Serves as RGB Replacement Filter    CMOS-Optimized Coatings    Reflex-Blocker Hard Coated    Life-Coat Sealed Coating Edges

• Increased contrast, matched for typical CMOS quantum efficiency and s/n ratio
• Reflex-Blocker coatings for freedom from halos, even under most adverse conditions concerning aux-optics
• Identical filter thickness to existing standards, with utmost care for parfocality
• Blackened edges all around, with filter-lead-side-indicator in the form of a black frontside outer rim to eliminate any reflection due to light falling onto the edge of a filter
• Each filter coated individually, with sealed coating edge (not cut out of a larger plate with coatings left exposed)
• Life-Coat: hard coatings to enable a non-aging coating for life, even in a most adverse environment

Related Questions and Answers

Q: 1. Does this work on Canon 7s renge finders from the 60s? They take a 39mm screw mount but not sure on threads and focal distance. Thanks

A: No, the Voigtlander Super Wide-Heliar 15mm f/4.5 Aspherical III Lens is not compatible for use on the Canon 7s 35mm Rangefinder Camera. The Voigtlander Super Wide-Heliar 15mm f/4.5 Aspherical III Lens uses the Leica M-mount bayonet mount whereas the Canon 7s uses the Leica M39 screw mount. Unfortunately, we have no lens mount adapters that convert the Leica M bayonet mount to the Leica M39 screw mount for your usage needs. However, while not identical, if you are looking for a lens with a similar focal length, you may purchase the FotodioX Pro Lens Mount Adapter for Nikon F-Mount Lens to M39-Mount Camera, B&H # FOPLMANFLM39, along with either the IRIX 15mm f/2.4 Blackstone Lens for Nikon F, B&H # IR15BSN, the Venus Optics Laowa 15mm f/4 Macro Lens for Nikon F, B&H # VE1540N, or the Venus Optics Laowa 12mm f/2.8 Zero-D Lens for Nikon F (Silver), B&H # VE1228NAIS, for your usage needs.

Q: 2. Can this lens be used on the NEX 7?

A: Works nicely on a Alpha 7II

Q: 3. Are normal 58mm Filters usable on this lens? Filters stacking isnt possible I think without vignetting or? I would like to use it with ND filters for landscape.

A: I am using an old Canon 58mm UV-Haze, not the slim type, and found no vignetting on Sony A7R.

Q: 4. When is this lens expected to ship?

A: We are expecting this lens to become available May 3rd, 2016. Please note this date is subject to change.

Q: 5. Does the lens on the Sony A7rii have auto (stop down) aperture?

A: No.

Q: 6. Can it be used with 58-77 step up rings? Planin on using with larger variable NDs to avoid vignette.

A: Yes, the Voigtlander Super Wide-Heliar 15mm f/4.5 Aspherical III Lens can be used with 58-77 step up rings.

Q: 7. Did anybody use it for astrophotography? How are the edges? Comma?

A: a good choice, I have been using this lens for astrophotography on my Sony a6000 (APS-C) and I have been very pleased with Milkyway shots at ISO12,800, f/4.5, and 20 seconds. I did consider the Rokinon 14 mm as it is cheaper and faster - but it is also longer and heavier. You also get a nice 10-point flair when a bright light is shining towards the lens

Q: 8. I'd like to use this lens for video purposes on a full frame a7s but I'm worried about extremely noticeable vignetting wide open. With the video settings at 24 fps and a shutter speed of 1/40th (or 1/50th), will the image have to much vignette wide open?

A: the original screw mount version has a lot of vignetting. This one has very little. the newer sony mount versions should be even better.

Q: 9. What are the uses of a 15 mm lense like the Voightlander , is this a good street photography lense? How does this stack up to a 35mm Zeiss lense.

A: You could use this lens for applications such as street photography, architecture, landscapes, and so forth.

Q: 10. What is the difference between version III and Ii?

A: Both are leica cl mount. Version 2 is smaller. Version 3 is supposed to be free are color fringing artifacts when USC with digital cameras such as the A7. I am not sure, but for film, version 2 may be just fine.