Choppy is just as good on center though even wide open. It\'s possible but I doubt it if his three copies are not hitting true infinity, which you can change by loss ending a couple screws under the focusing ring and adjust further out. I have done this with tech lenses but the fall off he is getting from normal corner to extreme edges says something different
DavidBM wrote: Fred Miranda wrote:
What\'s interesting is that my 4k monitor just died!
I am heading out to get a new monitor while I send this one for repair.
Here are 2 crop sets: Choppy vs E-mount at extreme edges and Choppy vs Distagon at the same area. (but different lighting and framing)
It\'s a huge difference in copy variance. Choppy is on the left when compared to the E-mount and top against the Distagon 15/2.8.
** Ignore the noise increase for the CV crops. This was vignetting correction which increased noise and crashed with my regular sharpening.
Choppy was set to f/5.6 and Distagon at f/8. It\'s incredible a good copy of the CV 15/4.5III looks great even at f/4.5 at the very corners. Sweet stop is f/5.6 with very minimum changes at f/8. I\'m loving this lens now!!
Choppy is mine now!
Startling!
Here\'s a hypothesis: maybe there\'s a bit of backwards field curvature in the extreme corners, and the lenses focus is calibrated slightly differently. If that was the case you would need to focus a little behind infinity in the centre to get infinity in the corners. And maybe you can\'t go that far back on most of these copies. Easy to test of course: if this is so, then on Choppy when he\'s best in the corners, the centre should be not quite as good as on a frame focussed a tiny bit closer...
Apr 26, 2016 at 05:13 PM
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