Monthly Archives: October 2022

The Mistery of the 70-200 F4 Aperture

Posted on 2022. October 9. by canonrepair

I have got a 70-200 F4, with a strange aperture problem: the aperture works, but not always. After disassembly I realized, thet the aperture ring on the part moves not perfectly smooth (by a screwdrivers tip). I disassebled completely. The … Continue reading →

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