Mamiya-Sekor 100 3.5. Changing shutter speed after cocking the shutter

Gregory Imler , Mar 01, 2009; 09:22 p.m.

This is a new lens for me, and earlier today I changed the shutter speed not realizing I had already cocked the shutter. This reminded me of the warning on Rolleiflex synchro-compures not to set the shutter to 1/500, cock it and then change the shutter speed. Is there any similar type of warning for the Mamiya-Sekor 100mm 3.5 or for leaf shutter lenses in general?

Thanks

Responses

Michael Axel , Mar 02, 2009; 12:03 a.m.

Yes, it's the same deal. This is the case with many leaf shutters. You should always adjust before recocking.

Markus Berndt , Mar 02, 2009; 09:30 a.m.

The Seikosha shutter does not have the extra spring that accellerates the shutter blades when set to 1/500s, like in the Synchro Compur shutter. As far as I can tell from looking at the innards of Synchro Compur shutters, this spring is the only reason why you should not change the shutter speed away from 1/500 on the Synchro Compur. I don't think that you can harm a Seikosha (or Seiko) shutter on a Mamiya Sekor lens by changing the shutter speed after cocking it. Of course, YMMV.