Robert Edward McClure
11-Jul-2009, 10:44
Hoping someone can help me here. Regrets in advance for relative complexity - I have tried to be concise and clear. :)
I have a project camera and the need for a shuttered lens around 50mm or under in focal length (and ability to cover a diagonal of 98mm).
But the rear lens barrel at its widest/rearmost point must not exceed 40mm in diameter - OR - the lens must allow focusing at infinity with its rear barrel's most extreme point at least 32mm distant from plane of focus.
Potential candidates so far are:
1. 55mm Mamiya TLR taking/shuttered lens. This could work but won't give me full coverage. Relatively cheap also.
2. 47/5.6 SA (non XL). Schneider stats at:
http://www.schneideroptics.com/info/vintage_lens_data/large_format_lenses/super-angulon/data/5.6-47mm.html
Question: Does "Back Focal Length" listed by Schneider (32mm) give me the 32mm I need above? I need to determine somehow what the difference in mm is between BFL (back element vertex to focus plane) and - the distance from rear lens barrel to focus plane. Are they the same or close to the same?
3. 35 Apo-Grandagon. The 35 Apo's rear lens barrel is listed at 60mm diameter. But I am unable to determine distance from the back of rear barrel to focus plane. I need at least 32mm or so minimum.
Thanks! Any help appreciated!!
Robert
I have a project camera and the need for a shuttered lens around 50mm or under in focal length (and ability to cover a diagonal of 98mm).
But the rear lens barrel at its widest/rearmost point must not exceed 40mm in diameter - OR - the lens must allow focusing at infinity with its rear barrel's most extreme point at least 32mm distant from plane of focus.
Potential candidates so far are:
1. 55mm Mamiya TLR taking/shuttered lens. This could work but won't give me full coverage. Relatively cheap also.
2. 47/5.6 SA (non XL). Schneider stats at:
http://www.schneideroptics.com/info/vintage_lens_data/large_format_lenses/super-angulon/data/5.6-47mm.html
Question: Does "Back Focal Length" listed by Schneider (32mm) give me the 32mm I need above? I need to determine somehow what the difference in mm is between BFL (back element vertex to focus plane) and - the distance from rear lens barrel to focus plane. Are they the same or close to the same?
3. 35 Apo-Grandagon. The 35 Apo's rear lens barrel is listed at 60mm diameter. But I am unable to determine distance from the back of rear barrel to focus plane. I need at least 32mm or so minimum.
Thanks! Any help appreciated!!
Robert