RX-100 aperture question

Started Aug 17, 2012 | Discussions thread
FocalPoint_L
Regular MemberPosts: 230
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Re: RX-100 aperture question
In reply to jmbass, Aug 17, 2012

The RX100 stops down to F11, but diffraction sets in quite a bit before. (F11 is still useful, e.g., for maximum DOF in macros or to use a slower shutter speed, however.)

Diffraction and other optical problems are focal-length dependent. And you have to trade off maximum center sharpness versus better edges/corners.

My own tests with my particular RX100 sample show:

Best for Center
28mm 2-8 – 5.0
35mm 2.8 – 5.0
50mm 4.5-5.0
70mm 4.5 – 6.3
100mm 4.9 – 6.3

Best for Edges
28mm 3.5 – 5.0
35mm 3.5 – 4.0
50mm 5.6
70mm 6.3
100mm 8.0

Best Overall Compromise
28mm 3.5 – 4.0
35mm 3.5
50mm 5.0-5.6
70mm 6.3
100mm 7.1

Where there’s a range of F-stops, it means the results are very similar and almost indistinguishable. The basis for these tests were landscapes with low-contrast foliage and other tough subject matter. Close-up tests using resolution charts yielded pretty much the same results.

LR

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