jan_brittenson Posted January 9, 2011 Share #21 Posted January 9, 2011 Advertisement (gone after registration) Yes, some apertures are sharper than others. But the difference is negligible compared to getting the image to look the way you want. Just like you'd pick focal length according to the result you want and not worry about which lens is sharper (because nailing perspective is more important than sharpness), you should select aperture for effect and not sharpness. For all practical purposes they're all 'sharp' and any difference is academical. Link to post Share on other sites More sharing options...
Advertisement Posted January 9, 2011 Posted January 9, 2011 Hi jan_brittenson, Take a look here 35 f/2 sharpness. I'm sure you'll find what you were looking for!
earleygallery Posted January 9, 2011 Share #22 Posted January 9, 2011 how do you know? I think the OP is talking about an imaginary lens, he says 'a new summicron' not the current summicron or the new summicron, but a new summicron, i.e. a new one which hasn't yet been made. Do I win the prize for most pendantic response? Link to post Share on other sites More sharing options...
mzcloud Posted January 12, 2011 Share #23 Posted January 12, 2011 As a general rule - general doesn't mean that it is always right - you can achieve the utmost sharpness at two stops lower then maximum aperture. That would be f/:4. With the best modern lenses you can achieve the optimum with less stepping down (the 2/90 AA is said to have it's optimum at f/:2.8, on stop down; the 3.4/135 Apo-Telyt at f/.4 - a half stop down; older lenses need to be stopped down more for their optimum: the pre aspherical 1.4/50 is said to have it's optimum only at f/:8 -- which would mean 5 stops down.). Though earlygalleries caveat is right: you won't see much difference in reality between 2 or more steps down. In the Leica Pocketbook, 7th edit Puts says that the optimum of the 2/35 asph. is between f/:2.8 and f/:4. so what will be the sharpest aperture for the 50 lux asph Link to post Share on other sites More sharing options...
jaapv Posted January 12, 2011 Share #24 Posted January 12, 2011 I would say somewhere in the f 2.0 That is one sharp lens, even wide open. Link to post Share on other sites More sharing options...
christer Posted January 12, 2011 Share #25 Posted January 12, 2011 I would say somewhere in the f 2.0 That is one sharp lens, even wide open. ...... and in the corners! Link to post Share on other sites More sharing options...
mzcloud Posted January 12, 2011 Share #26 Posted January 12, 2011 I would say somewhere in the f 2.0 That is one sharp lens, even wide open. I waited 8 month for this lens, will mostly shoot portraits so do not always focus on the corners.. but I am going test it to see how it performs in the corners Link to post Share on other sites More sharing options...
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