Rolleiflex SL66 500/5.6 HFT Tele-Tessar with filter problem

fuwen

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May 18, 2006
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Bought a 500/5.6 Tele-Tessar HFT recently. To my surprise the lens cannot focus at infinity with a filter on, and focus spot on at infinity without the filter. Did some more tests and realised that the filter seemed to affect the image quality and I could tell from the view finder of a Contax Aria. So from now on no filter for this lens.

I have a Pentacon 500/5.6 it does not have the same focusing issue. The focusing is the same with and without filter.

Anybody has the same experience with this lens or other lens?
 
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