Donald Qualls
Subscriber
A couple days ago I went out to make some images for the APUG 3rd anniversary. Among other things I discovered (like how to salvage a Tri-X film sheet exposed through the antihalation base), I was astounded to discover that I could see the ground glass more readily at f/22 under a simple black t-shirt dark cloth than I could in just the folding hood at f/4.5.
How come nobody mentions that those hoods are only for desparation shots, like "I was planning to scale focus, but here's a scene that just *has* to be set up on the ground glass!"
It was also amazing to me, after understanding how depth of field works for something like 35 years, to finally, for the first time, actually *see* the image get sharper as I stopped down -- even in an SLR, I was never able to see the f/16 image well enough to see how much DOF I was gaining, but on that 9x12 cm ground glass, with my head in the t-shirt, I could see the grass and rocks close to the camera get sharper, and sharper, as I stopped down from f/4.5 to f/22. I had to restrain myself from going all the way down to f/45 and accepting the slow shutter -- wasn't needed, and no reason to give up resolution to diffraction, but *damn!*
Look for the print scans in the Anniversay gallery after my next darkroom session...
How come nobody mentions that those hoods are only for desparation shots, like "I was planning to scale focus, but here's a scene that just *has* to be set up on the ground glass!"
It was also amazing to me, after understanding how depth of field works for something like 35 years, to finally, for the first time, actually *see* the image get sharper as I stopped down -- even in an SLR, I was never able to see the f/16 image well enough to see how much DOF I was gaining, but on that 9x12 cm ground glass, with my head in the t-shirt, I could see the grass and rocks close to the camera get sharper, and sharper, as I stopped down from f/4.5 to f/22. I had to restrain myself from going all the way down to f/45 and accepting the slow shutter -- wasn't needed, and no reason to give up resolution to diffraction, but *damn!*
Look for the print scans in the Anniversay gallery after my next darkroom session...
