Dear Jarin, I have a whole chapter on this subject but it's too are for pug.email me at rwlambrec2GMAIL.COM AND I'LL SEND YOU A FREE COPYHi all:
I'm a new 8x10 shooter with only a 300mm lens so far. Being aware of diffraction limits, I've been trying to keep my photographs in the f/22-32 range. However there have been more than a few subjects that have absolutely needed f/45 and f/64. I employ movements and the scheimpglug principle as I can, but the images have many layers and directions of interest beyond a single diagonal plane.
In a little time, I will have the experience to answer the question for myself, but before enough results are printed at various sizes, I'm curious to hear people's opinions regarding enlargement limits from different camera apertures. For example, at what enlargement ratios can one perceive sharpness differences between a negative shot at f/22 and those shot at f/45, and f/64, presuming otherwise ideal circumstances and technique.
I use a 300mm apo sironar-s and fp4 film developed in Wimberleys metol-pyro formula.
Thanks!
Jarin
interesting! Never heard of it but sounds reasonable!Rather than doing the calculations from first principles every time I use "the 3 millimetre rule".
This says that if the final photograph size from an uncropped negative is 8" X 10" then the physical diameter of the lens aperture has to be 3mm or larger to keep diffraction effects just below the limits of visibility. For a 300mm normal lens on a 8x10 camera this means f100. For a 50mm lens on a 35mm camera this means f16. For other enlargement sizes the aperture diameter requirement changes proportionately: 6mm for a 16" X 20" photograph, 1.5mm for a 4" X 5" photograph, and so on ...
Sometimes lack of depth-of-field is a bigger sin than diffraction and I'll stop down further.
Dear Jarin, I have a whole chapter on this subject but it's too are for pug.email me at rwlambrec2GMAIL.COM AND I'LL SEND YOU A FREE COPY
Sometimes lack of depth-of-field is a bigger sin than diffraction and I'll stop down further.
Does anyone know the lp/mm of a diffraction-limited lens, at f/32, f/45 and f/64?
When I am next forced to go to f/45 and f/64, it would be good to know the largest print size that I can still deliver 8 or 10 lp/mm in the finished print...
J
Does anyone know the lp/mm of a diffraction-limited lens, at f/32, f/45 and f/64?
When I am next forced to go to f/45 and f/64, it would be good to know the largest print size that I can still deliver 8 or 10 lp/mm in the finished print...
J
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