P., the reason modern lenses that open to f/5.6 are usually recommended for use at around f/22 is that they gain coverage when stopped down from wide open. As has already been mentioned, we don't know what you are trying to accomplish -- sorry, I'm too lazy to look up the photographer whose work you mentioned in your first post -- and most of us will agree that since you have lenses that open to f/5.6 and haven't shot them opened to f/5.6 you should try them first. The results might be what you want.
Smaller Symmar-S/Apo-S/etc are already pretty sharp at f/8 and super-good from f/11 down. The bigger ones from 210 up need a bit more stopping down to be sharp over a decent area.
I agree with Oren and Dan though, for wider-open shooting, they will be softer in the file and more vignetted, but it depends what you want. Maybe for more softness but less vignetting, at f/5.6, you might be better with a f/4.5 Tessar.
In Linhof Advertising of the day Schneider Symmars were touted as being totally usuable wide open. Back then sheet Kodachrome and E3 Ektachrome were sloooow. Being able to use these lenses wide open was an advertising plus for Linhof. I remember a Guy standing on a rocky outcrop in pounding surf, using either a 5x7 or 8x10 Linhof camera hand held with wide open lens.
So, ditto on trying it wide open! My advertising literature says it is sharp wide open.
For my uses I prefer the f4.5 Schneider Xenars which are great IMO wide open.
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The old lens comparison charts often gave lp/mm wide-open, no?
The photographer mentioned (http://www.joaquinparedes.com/) has wetplate portraits, figure studies, etc which are not particularly sharp. If this is what you are after I would think a f4.5 or better a f3.5 Xenar or Tessar would be fine. Your 300mm Xenar at f5.6 should also fine, maybe a bit slow.
Thank you all for your replies and advices.
Before buying anything, I'm going to try all my lenses wide open to see if it fits on that look.
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