Olympus Zuiko Auto Macro 2/20mm

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[Manualman]

in the days of analogue film it was an important argument to always be able to set the aperture at full.

I find it useful in setting the principal plane of focus accurately, whether by eye or by focus peaking. It would not work if the lens suffered from focus shift.

[K_Mar]

Auch hierzu gibt es eine ursprüngliche Objektivvorstellung:
https://www.digicamclub.de/showthread.php?t=24719

Auf diese Art wird der Testbereich zerfleddert und unübersichtlich