Originally Posted by
Jason Greenberg Motamedi
An easier question to answer (although still largely in the realm of anecdotal evidence) would be which lens is sharpest at f/2.8, or f4.5, or f/5.6...
I can tell you that at f5.6 my 150mm Sironar-S is sharper than my 150mm Xenotar at f2.8 (which is true), but is that a reasonable comparison? Or perhaps it would be better to say that f5.6 my 150mm Sironar-S is sharper than my 150mm Xenotar at f5.6, (also true). Which do you mean? Or better yet, what f/stop do you want to work at?
If you want shallow depth of field you might be better off looking for a long lens, say a 450mm f/9 than a fast and short lens.
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