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Thanks for comment, guys. I think I have been using flat finger technique on and off for a while. If I really concern about shake, use 2s timer whenever it is possible before I send in my M9 Again, since my 50lux is off in mid range again.
Now a new question: I tested my 50mm lens on hand yesterday lunchtime. I bought another 50cron Rigid during recent camera fair. since it is even earlier with different focus ring. more prettier, similar with DR version. I will upload a pic for both of them to make it clear later.
I notice: with 1M range,focus is about right. Infinity is also about right. (my lux always slightly pass infinity even after adjust from Leica NJ) but 3M range, all of them back focused. Is that possible? I think it might lead to body problem since all three lens have similar behavior. Any comments?
One thing might interesting you is I almost get exact performance between two 50cron, That is definite something you want expect from Leica. You expect almost exact performance even after 50 year. What a impressive quality control.
I also confirm that 50lux is incredible sharp infinity. sharper than 50cron at f2. I see alias/moire WO on the roof infinity within 12mm cycle. That is match their published MTF. but not in 1M range, it has about the same sharpness as my 50cron. Both 50cron rigid is also very good center at f2, has moire in center as well at f2, but only 4-5mm cycle. At f5.6-f8, they are slightly worse than 50lux overall(very minor), but at 3/4 frame 50lux FC dip zone, 50cron actually better.
To surmise a little based on my personal experience along with Ron's feedback, if you think 50lux can do wonder WO during normal shooting,(.7-2M range portrait) you will be disappointed. it will not perform much better than 50 sonnar, pre-ASPH or even sharp 1.4 lens from other manufacture. Unless you shoot f1.4 landscape or do art reproduction in dark museum. its in focus plane seems cover 10-12mm cycle, bigger than most lens I have, that is huge plus to me. it also has very smooth Bokeh, smoother than almost any other lens I have seen.
I feel its outstanding performance really show up with the distance increased. so it will be very good after 3M range give you nice isolation and low light performance. a MedFomat look. I also like its Bokeh at that range much better since it give a little more background shape than blur blur and blur.
Ryan, another exotic lens from you. It is a incredible setup. Love that flare.
Airfrog, nice portrait!
Edward, love to see you in action. That is very 3D. must be from some fancy glass!
Winston, Another wonderful BW.
Here are few more 21