jimgalli
Subscriber
Jim, in my limited experience f/6.3 tessars have been better than f/4.5s.
Probably so but when they were new the f4.5 were flagship items and the f6.3's were also-ran's for the folk who were poor. J
Jim, in my limited experience f/6.3 tessars have been better than f/4.5s.
Hello,
Yes I have read largeformatphotograhy.info site and some other resources, and still am confused in few things. And they are:
1. How to determine which focal lenght for what format? That is how to decide/calculate focal lenght of lens I need to have all movement of camera (including scheimpflug) and avoid vignetting?
2. How to determine/calculate ratio between bellows lenght/focal lenght of lens, that is to be able to focus lens from closest focus to infinity what bellows lenght I need?
3. How to determine wide lenses needed, and do I need long or telephoto lenses if I go to longer than normal lenses.
Basically, how to calculate what lens I need for particular camera format at same time keeping movement of camera, focusing through all focus range, and to have whole image and not cropped image or vignetting?
Next thing is reading lens charts. For example Schneider have lens info with telling "this lens is suitable for this format" and Rodenstock have lens charts which tells "this lens using with this format has tilt horizontal x vertical Y". How to read those charts, that is what shift in that situation means.
If answer will be too long, please, source of informations would be appreciated.
Thanks.
True but irrelevant. I never took you for the sort of ignorant yuppie scum that, not knowing better, uses price as a measure of performance. You and I both know that this isn't always the case. Yuppie scum assume that po' folks like me, who have, use, and like, cheap f/6.3 Tessars don't know what's good. And in fact I use some of my old lenses pour epater les bourgeois.Probably so but when they were new the f4.5 were flagship items and the f6.3's were also-ran's for the folk who were poor. J
True but irrelevant. I never took you for the sort of ignorant yuppie scum that, not knowing better, uses price as a measure of performance. You and I both know that this isn't always the case. Yuppie scum assume that po' folks like me, who have, use, and like, cheap f/6.3 Tessars don't know what's good. And in fact I use some of my old lenses pour epater les bourgeois.
Eric Beltrando, whose site you like, has calculated coverage and performance for a variety of tessar types. His curves show that f/6.3ers beat f/4.5ers. When I told him I'd got an f/6.3 Saphir, he remarked that it should be outstanding across the field wide open.
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