Pana 20mm - Difference btw 1.7 and 1.8?

Started Oct 2, 2012 | Discussions thread
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Bryan Biggers
Bryan Biggers Veteran Member • Posts: 3,518
Re: Pana 20mm - Difference btw 1.7 and 1.8?

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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