Pana 20mm - Difference btw 1.7 and 1.8?

Started Oct 2, 2012 | Discussions thread
Bryan Biggers
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Re: Pana 20mm - Difference btw 1.7 and 1.8?
In reply to MarcusBrody, Oct 2, 2012

The 20mm is pretty much sharp across the board until you get to the smaller apertures where maybe diffraction kicks in. It is just a teeny tiny bit sharper at f/2.8 than wide open. It actually has less chromatic aberration wide open. So there is not much advantage if at all in stopping it down. See http://www.photozone.de/olympus--four-thirds-lens-tests/464-pana_20_17?start=1

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