Fast lenses, and High ISO

Started Jul 18, 2014 | Discussions thread
bosjohn21 Forum Pro • Posts: 20,072
Re: Fast lenses, and High ISO

while I think using a shallow depth of field has become a cleche its still useful. But I think more importantly the fast lens also moves down its so called sweet spot two or so stops below wide open where the optical performance is at its best. Using a fast lens also means having better sharpness and because the lens will deliver optimum performance two stops faster than a normal f 2.8 or sof this less distortion in conjunction with hi iso,

on the other hand Lens design is all compromises and the price paid for f1.4 is a nth less resolution in the center and a bit more on the edges,  In most photograph images this will be meaningless.

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John aka bosjohn21

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