Super Takumar 50mm 1.4 Diaphragm Won't Bounce Back - HELP

cameracravings · 05-12-2018, 08:16 AM

Super Takumar 50 1.4 When pushing a stop-down pin on the rear of the lens, the diaphragm would close down but when letting the pin go the diaphragm would stay closed. It won't bounce back to wide open position. The lever is switched to AUTO. Took it apart looked at diaphragm mechanism all looks OK, but I may be missing something. I am not familiar with this lens. Maybe a part is missing or a spring is out of place? Would appreciate any ideas. What is the mechanism moving diaphragm to close and back to open? Diaphragm blades move freely and easy.

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edom31 · 05-14-2018, 09:02 AM

THis sounds more like sticky/oily blades, rather than a fault at the mechanism. Do the blades slowly open once again? Once closed, how can you reopen to Max aperture?

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05-14-2018, 09:02 AM	#2
edom31 Pentaxian Join Date: Nov 2017 Location: Garden City, NY Photos: Gallery Posts: 6,349	THis sounds more like sticky/oily blades, rather than a fault at the mechanism. Do the blades slowly open once again? Once closed, how can you reopen to Max aperture?