One shot from the new for me CZ Sonnar 50/1.5

It's a great lens and a good lens test. It shows performance across the full-frame. Typically, if the elements are mis-centered, an edge will suffer.

A rebuilt J-3, wide-open at f1.5.

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It's a good test that the front element is centered properly. I use an ultrasonic cleaner to vibrate the lens as the retaining ring is tightened. Theory is the vibrations help center it.
 
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