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I asked a question on this FR on CN a couple of years ago. Not for the same application or scope. Mine was for a 100 ED f9 and using it to get wider views than I could with a 40mm 68º.
Wouldn't work for what I wanted due to the limiting CA of the FR. From memory it's 38mm? Might work for yours though. What is the field stop size of the Quark?
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