EXCERPT page containing first few paragraphs. 2019-05-21 08:51:19
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“Summilux” is Leica-speak for f/1.4, but that rule is apparently violated for the first time by using it with an f/1.7 lens.
The Panasonic Leica DG Summilux* was introduced in mid-2014 as a follow-on lens to two other fast Panasonic Leica lenses, the 25mm f/1.4 DG Summilux, and perhaps the best MFT lens available, the 42.5mm f/1.2 DG Nocticron. Those siblings do not disappoint.
Thus, your author was at first puzzled by the apparent contradiction of the seemingly excellent qualifications and very poor results observed initially.
The explanation turns out to be a pronounced rearward focus shift, easily the most severe your author has ever observed in a Micro Four Thirds lens. Unacceptable really, and a huge hassle for practical use. The sad truth is that the 15/1.7 is a very high performer, but good luck achieving that performance where intended (intended focus vs actual focus for the shooting aperture).
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Diglloyd Guide to Mirrorless offers comprehensive integrated coverage of most APS-C and full frame mirrorless cameras and lenses.
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