“ Of particular interest is our observation that this lens, currently, focuses wide open* on an a7R II (or, technically, opens up to F2 if you've selected an aperture smaller than wide open). This addresses one of our largest complaints with recent Sony lens releases that focus stopped down, often slowing focus in low light or forcing otherwise capable phase-detect AF systems to revert to contrast detect-only. It appears that, at least for now, Sony's recent 100mm STF and 85mm F1.8 lenses address this issue, and without an image cost to boot: take a look at our aperture series with our LensAlign target here (please choose the option to 'Open Link in New Window'), and you'll note no focus shift as we stop down (the lens was focused once wide open, then switched to MF for the series). You can also judge problematic apertures for axial CA in this series, as well as how circular out-of-focus highlights remain as you stop down the 9-bladed aperture.
Oddly, the same doesn't hold true on other Sony bodies: the lens focuses stopped down at the shooting aperture on an a7 II, a7S, and a6300/6500. Oddly, this sometimes leads to slight front-focus at smaller apertures on those cameras, though it's not a huge deal as the focus shift is often masked by the increased depth-of-field. It's interesting from an academic standpoint though - as focusing at the selected aperture should increase focus accuracy, not decrease it. We have our hypotheses, but for now, we've reached out to Sony for comment. „
Qui per il resto dell'articolo
www.dpreview.com/samples/4348798595/sony-fe-85mm-f1-8-sample-gallery 
JuzaPhoto contiene link affiliati Amazon ed Ebay e riceve una commissione in caso di acquisto attraverso link affiliati.
) direi quello che scrivo. 
