Does anyone know why this happened? I set my lens to T on Mirror lock up. Set the mirror up, and then fired the shutter through my cable release on the lens. Was counting to do a 70 second exposure and i hear the lens automatically close on 30 seconds...This has never happened before... and I don’t see how it would’ve been possible for me to have closed it accidentally considering I didn’t move the shutter speed ring back or cock the arm lever. I don’t know if it matters but I was using the 180mm 4.5. Does anyone have any ideas? Maybe my lens has gone bad...
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Shutter closed automatically on T?
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