stephen_komp Posted January 12, 2018 Share Posted January 12, 2018 I recently purchased a Mamiya c330 with an EX+ condition 80mm f2.8 Sekor lens. The lens works great and is accurate at all speeds. However, when I switch it to BULB, it won't stay open. It closes immediately. Am I doing something wrong? This is my first experience with a Mamiya TLR. Thanks - Steve Link to comment Share on other sites More sharing options...
conrad_hoffman Posted January 12, 2018 Share Posted January 12, 2018 Just to be clear, bulb only stays open so long as the lever is held down. Time (T) will stay open until you press the lever again. Link to comment Share on other sites More sharing options...
rodeo_joe1 Posted January 12, 2018 Share Posted January 12, 2018 Have you tried it with a cable release screwed in? IIRC, the manual release lever only flicks the internal firing pin momentarily on those Seiko shutters. Link to comment Share on other sites More sharing options...
stephen_komp Posted January 12, 2018 Author Share Posted January 12, 2018 Just to be clear, bulb only stays open so long as the lever is held down. Time (T) will stay open until you press the lever again. Yes, I should have been more clear. I do hold it down but it closes right away. Link to comment Share on other sites More sharing options...
stephen_komp Posted January 12, 2018 Author Share Posted January 12, 2018 Have you tried it with a cable release screwed in? IIRC, the manual release lever only flicks the internal firing pin momentarily on those Seiko shutters. I'll try that. Thanks !!! Link to comment Share on other sites More sharing options...
stephen_komp Posted January 13, 2018 Author Share Posted January 13, 2018 Have you tried it with a cable release screwed in? IIRC, the manual release lever only flicks the internal firing pin momentarily on those Seiko shutters. rodeo_joe: That did the trick. I really thought something was wrong with the lens. Thanks for the advice. Link to comment Share on other sites More sharing options...
conrad_hoffman Posted January 16, 2018 Share Posted January 16, 2018 FWIW, I just pulled my C330 off the shelf and checked various lenses. They all stay open when the lever is held down, both old chrome and newer black shutters. That's with the lens in hand, not on the camera. I didn't check using the body release. More importantly, I've found the inner surface(s) of the rear group on these lenses are made of a glass that's like candy to fungus. Seriously, they are the most fungus-prone lenses I've ever seen. The old chrome ones are the worst. Black shutters less so. Keep a close eye on them (use a penlight) and clean or get them cleaned at the first sign of haze, speckles, roughness or threads. 1 Link to comment Share on other sites More sharing options...
stephen_komp Posted January 16, 2018 Author Share Posted January 16, 2018 FWIW, I just pulled my C330 off the shelf and checked various lenses. They all stay open when the lever is held down, both old chrome and newer black shutters. That's with the lens in hand, not on the camera. I didn't check using the body release. More importantly, I've found the inner surface(s) of the rear group on these lenses are made of a glass that's like candy to fungus. Seriously, they are the most fungus-prone lenses I've ever seen. The old chrome ones are the worst. Black shutters less so. Keep a close eye on them (use a penlight) and clean or get them cleaned at the first sign of haze, speckles, roughness or threads. Link to comment Share on other sites More sharing options...
stephen_komp Posted January 16, 2018 Author Share Posted January 16, 2018 Will do. Thanks. Link to comment Share on other sites More sharing options...
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