Dearest Uraniumnitrate,
you wrote....
"The fast cone is sharpness in one point if I understand it right a 120 mm on the 120 mm lens at infinity! For example if you say I use the f stop for increase the dept of field it’s okay but at the same time you loose much value of it as the dept of the field works as I described on page two!! If you go back to that page there you might understand what I mean!
Now of course if you think using the smallest aperture solve the problem you are wrong. It won’t as all lenses have the best working aria which is in modern large format lenses are on f22. That means the lens giving its absolute best performance on just that or very close f stops! All other f stop use is resulting poorer image quality!"
Well... frankly, I don't know what you mean...
perhaps there is a communication problem. Going back through this thread, there IS a reference to the 1/3 - 2/3 general rule for DOF (which isn't imperically true BTW), however the use of a calibrated DOF scale on a precision Helical Focus Mount in no way forces one to choose ANY specific aperture. What it does, is provide one with precise information from which an evaluative decision can be made.
In an earlier posting, you also wrote...
"Do you wanna help? Than give me some ideas how to create a good shade for a lens which is a 100 something degree with out vignette my neg and how to attach that to the camera! For the time being this is the only reason I’m here and nothing else!"
So Be It... I would suggest you contact the following company, who can build you a bellows lens shade to any dimension you provide them with...
Camera Bellows (
http://www.camerabellows.com) Tony Eaton is the
Works Director, and a very knowledgable fellow (teaton@camerabellows.com). I'm sure he can resolve this singular issue.
[Inappropriate link deleted--d.g.]