Choosing the sharpest aperture...

Started Jul 19, 2012 | Discussions thread
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xpatUSA
xpatUSA Senior Member • Posts: 8,111
Re: Choosing the sharpest aperture...

Most sites that test lenses will provide the sharpest aperture for your lens which gives a starting point for test. There are normal variations in production for all lens models, so testing each side of that point is worth while.

Already mentioned above is the matter of diffraction. A very good example is my own set-up for close-up shots of watches. I use a Sigma 70mm macro - well known for it's sharpness. Almost a waste of money though - because I shoot mostly in low-resolution on a Sigma SD10, effectively 18.24 um sensor pixel pitch (true binning). For such shots, I find no discernible difference from f/2.8 all the way up (down?) to maybe f/16 as far as apparent sharpness is concerned.
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Best Regards,

Ted.

 xpatUSA's gear list:xpatUSA's gear list
Sigma DP2s Panasonic Lumix DMC-G1 Sigma SD10 Sigma SD1 Merrill Panasonic Lumix G Vario 14-45mm F3.5-5.6 ASPH OIS +7 more
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