I do what Doremus does. I have tables for my most used lenses. Recently I found myself using a 125mm lens instead of the 135mm in my notebook, and just took an educated guess, and it worked out fine.
I do what Doremus does. I have tables for my most used lenses. Recently I found myself using a 125mm lens instead of the 135mm in my notebook, and just took an educated guess, and it worked out fine.
Bellows factor is unlikely to be the most significant point-of-failure in technique. Get a ballpark figure and work backwards. Composition considering light, interpreting fundamental exposure, processing, printing will f*ck you up enough. We cannot just make a list of our worries at the keyboard and consider it a work flow. That ain't even a start.
The hardest start is starting. Keep it simple at first, recognize mistakes. There is no recipe.
Unless you're using telephoto lenses, the rear nodal point is around the aperture's location. If you want to find your rear nodal point, focus your 135mm lens at infinity, and measure 135mm forward from the ground glass.
Personally, I think the best way to figure bellows extension is just to figure out your actual f/stop. It's just a ratio, a fraction, if you will. Measure your bellows extension; that your focal length. Measure your aperture opening diameter through the front cell, (it magnifies a little, and you have to let that figure in); that's your aperture. Divide focal length by aperture. That's your actual f/stop. That's all it is.
"I love my Verito lens, but I always have to sharpen everything in Photoshop..."
What Jimi said. Works great for me.
Of course, teles are those that would induce noticeable errors if used with close subjects and not being aware about rear node location.
Convertible Symmar and Symmar-S (plasmats) have the node some 3-5mm in front of the lensboard. Super-angulons (biogons, IIRC) have the node 7 to 20mm in the rear.
This the data for SCH vintage compiled by MAubrey:
Comparing numbers of "Effective FL" with "Flange FL" we find were the rear nodal point is actually, measuring from lensboard's outer side.
https://www.largeformatphotography.i...s+-+Sheet1.pdf
https://docs.google.com/spreadsheets...it?usp=sharing
Well, it's a biogon derivative...
At least here says "The lenses branded Super-Angulon (sold by Schneider Kreuznach and Leica Camera) are based on the construction of the Biogon."
https://en.wikipedia.org/wiki/Zeiss_Biogon
Here it explains how it is seen the tilting pupil effect, (of russian influence, after it was redesigned)
https://www.largeformatphotography.i...l=1#post817068
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