Topic: Accurate long exposures mechanical shutters (Read 1561 times)

Kumar · « **on:** November 05, 2009, 11:27:41 am »

I use an Imacon 132C back on a Sinar. My lenses are all mounted in Prontor Professional shutters.

Is there a way to get accurate, consistent exposures in the 2~10 seconds range? I have the Prontor Professional timer, but winding the clockwork mechanism for each exposure is a pain. I know about the Rollei, Schneider and Horseman electronic shutters. The KaptureGroup solution does only short exposures, and needs AC power. Has anyone made a portable release using a battery-powered solenoid?

Ideas welcome!

Kumar

shutay · « **Reply #1 on:** November 05, 2009, 11:35:48 am »

Hi Kumar, I've e-mailed you directly on this.

Thanks.

Kumar · « **Reply #2 on:** November 06, 2009, 12:42:24 am »

Would it be possible to trigger the back externally with a timer, keeping the lens open on B?

Kumar

shutay · « **Reply #3 on:** November 06, 2009, 07:51:40 am »

I would imagine that you should be able to try this using 2 lenses - mount one and keep it open on B. Make sure the sync for the back is not connected to this lens. Then use another lens on the side that has the sync cable connected to this lens and then play around with the exposure times by controlling it with this 2nd lens.

Kumar · « **Reply #4 on:** November 06, 2009, 09:21:08 am »

Jason, I've already tried this. The B setting doesn't work - there's a green and/or magenta cast, blooming from specular highlights and so on and so forth. I'm talking to a couple of people, and we're hopeful of a solution.

Cheers,
Kumar

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