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Forum: General Photography 06-02-2015, 05:58 AM  
Why are fast lenses sharper?
Posted By reeftool
Replies: 43
Views: 4,274
Faster lenses tend to be sharper simply because it requires some pretty good optics to get an acceptably sharp picture at a wide aperture. I said "tend" because back in the film days, there were a lot of relatively fast lenses that sucked wide open. They were "fast" mostly to have a brighter viewfinder and that was helpful with manual focusing. I own a few. Stopped down a little, even those old dogs do pretty good.
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