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Astrophotography and Sketching >> Film Astrophotography

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Mopman
sage
*****

Reged: 10/14/06

Loc: Richland, WA, USA
Re: Large format astrophotography new [Re: Hikari]
      #6246212 - 12/11/13 01:29 AM

I did some playing in the garage tonight. The image is a circle about 90 mm in diameter. Looks to be limited by my film holder/shutter assembly as much as the focuser. I could not tell if there is vignetting. I think 90 mm translates to about 8* FOV with the 24" Focal Length. Thanks! Gary

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Nightfly
Pooh-Bah


Reged: 06/20/07

Re: Large format astrophotography new [Re: Mopman]
      #6247705 - 12/11/13 07:18 PM

Sounds like it would just cover a 6x7 frame (89mm image circle) and give a circular field on 4x5 sheet film. Not too shabby just the same. Field illumination might be a different issue as well as aberrations. You'll have to shoot it and find out!

Fun stuff Gary.


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Mopman
sage
*****

Reged: 10/14/06

Loc: Richland, WA, USA
Re: Large format astrophotography new [Re: Nightfly]
      #6248804 - 12/12/13 11:12 AM

Should be fun There might be a Version 2 in the works
Clear Skies!


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Nebhunter
Carpal Tunnel


Reged: 10/04/03

Loc: Frostbite Falls
Re: Large format astrophotography new [Re: Mopman]
      #6253338 - 12/14/13 08:07 PM

Gary this is great new. Interesting project and I hope it works for you. Another option might be to get a film back for the 4x5 in 6x7 or 6x9. That way you can shoot 4x5 and switch to another film in MF for B&W or E200. Good luck shooting my friend.

Igor


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Mopman
sage
*****

Reged: 10/14/06

Loc: Richland, WA, USA
Re: Large format astrophotography new [Re: Nebhunter]
      #6254818 - 12/15/13 04:49 PM

Thanks Igor!!! Good idea; my Pentax 67 body should thread right on. I think I have a Mamyia 6 x 9 film back around here somewhere I could adapt.

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