Glass in the Path: Why Using Adapters May Hurt Your Image Quality


Mu-43 All-Pro
Sep 25, 2011
Brisbane, Australia
Real Name
I had no idea that a simple piece of flat glass would make such a difference. But I vaguely recall some of the longer lenses with drop in filters recommending to have simple uv/skylight filter in place which not using any other filter, because a filter in that location is part of the optical design.

This may actually be one of the reasons why so many of us see huge benefits in using a focal reducer with film era lenses vs using 'dumb' adapters. The focal reducer is (hopefully) designed to take the 4mm glass sensor stack into account. A dumb adapter obviously isn't.

Presumably this 4mm stack would also be part of the m43 standard, otherwise native lenses might not work so well if suddenly Olympus switches to a 1mm stack.
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