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Edward, nice street set, but your cup shot is wonderful, rendering and color is beautiful. Look forward to see your sonnar shots. one thing curious, you said it is optimized at f1.5, how is the focus accuracy, I seems remember Zeiss lens is designed for IKON with short flange distance, so always slightly back focused with Leica, do you have this problem?
Thank you very much for the nice comments, Zhangyue. Greatly appreciated. Very nice set with the Lux, lovely rendering!
As for the Sonnar, according to my MFD ruler test, focus is most accurate at f/1.8. It is very slightly front focusing at f/1.5 but within user error, but at f/2.8 the focus shifts backwards by 2-3 cm.
As far as I understand, Zeiss currently calibrates the ZM lenses for the Leica digital bodies. A couple of months ago, they discontinued the Zeiss Ikon, so it doesn't make sense to calibrate the lenses for film. It seems that latest batches of the Sonnar are calibrated for best focus at f/1.5 due to the market requests. I personally find it makes sense to calibrate it for f/2.8 for general use, unless all what one wants to do is shoot it wide open.