The Super Elmar 15 3,5 for R - Zeiss design : I'm vaguely tempted by it... there is one for sale at a not indecent price (about half than a new Zeiss 15 ZM); R to M adapters are easy to find... focusing ought not to be a big issue... of course :
1) Is terribly bulky compared to the CV 15
2) No way to manage UVIR filtering onto M8
3) Most important, it can be problematic (impossible ?) the use of an external VF on the accessory shoe... front is really WIDE.
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I wonder if someone in the forum has ever used this lens on a M8/M9.