alanrockwood
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- Joined
- Oct 11, 2006
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Just out of curiosity, has anyone measured the width and length of the Pen F/FT half frame image? I mean measured accurately with a caliper? I measured the full frame dimensions on one of my Canon Rebel film cameras, and it came out 23.9 x 35.9 mm, give or take a few hundredths of a mm. It would be interesting to know the accurate numbers for a good half frame camera.
Just for fun, I calculated the diagonal dimension for full frame and half frame if one were to crop to an 8x10 aspect ratio with minimal cropping loss. I assumed that full frame was 24x36mm and half frame was 18x24mm. The diagonal for cropped full frame came out to be 38.419mm and the half frame came out 28.814. The half frame diagonal came out to be 75.0% that of the full frame diagonal. For the uncropped diagonals the ratio came out to be a little less at 69.3%.
75% linear scaling going to half frame (for an 8x10 print) compared to full frame doesn't sound too bad to me. I think a half frame photo on fine grain film like Tmax-100/Acros/Delta would probably compare favorably with a full frame image on a conventional film of nearly the same iso, such as FP4+, at least in terms of grain. Resolution might also be more or less comparable (when using fine grain film on half frame vs. conventional film on full frame), given the fine reputation of lenses for the Pen F/FT cameras. This assumes that the resolution of fine grain film like Delta is somewhat higher than conventional film like FP4+.
So, if the above calculations and conjecture are right then if someone is satisfied with images using conventional film acquired with a full frame camera then they would probably be satisfied with images acquired using fine grain film on a half frame camera.
Whad'ya think?
Just for fun, I calculated the diagonal dimension for full frame and half frame if one were to crop to an 8x10 aspect ratio with minimal cropping loss. I assumed that full frame was 24x36mm and half frame was 18x24mm. The diagonal for cropped full frame came out to be 38.419mm and the half frame came out 28.814. The half frame diagonal came out to be 75.0% that of the full frame diagonal. For the uncropped diagonals the ratio came out to be a little less at 69.3%.
75% linear scaling going to half frame (for an 8x10 print) compared to full frame doesn't sound too bad to me. I think a half frame photo on fine grain film like Tmax-100/Acros/Delta would probably compare favorably with a full frame image on a conventional film of nearly the same iso, such as FP4+, at least in terms of grain. Resolution might also be more or less comparable (when using fine grain film on half frame vs. conventional film on full frame), given the fine reputation of lenses for the Pen F/FT cameras. This assumes that the resolution of fine grain film like Delta is somewhat higher than conventional film like FP4+.
So, if the above calculations and conjecture are right then if someone is satisfied with images using conventional film acquired with a full frame camera then they would probably be satisfied with images acquired using fine grain film on a half frame camera.
Whad'ya think?