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Photo Forum / Film Photography / Medium format / February 2007Mamiya RB67 time exposure?
To experienced Mamiya RB 67 users: I just recently purchased a Sekor C 180 mm for a Mamiya RB67. I find the behaviour of the "T" setting for long time exposures a bit queer. As I have no experience with Mamiya yet I do not know if this alright or if the lens has a defect. And this is what happens on "T" setting: operating the release button opens the shutter. It is not possible to operate the release button a second time to close the shutter again. The only way I found to close the shutter is, to press the lever on the side of the camera that rewinds the shutter. This I find a bit strange as it induces a possibility to move the camera and it does not facilitate to stop the time exactly. I don't have the 180 but have a 140 KL macro, a 250 KL and a 90 KL and use these with a double cable release so that it locks the time/shutter up until I've finished the exposure and which point it closes. If you got it from a shop ask them to check it and see if it needs work under a warranty when you bought it. Duncan > To experienced Mamiya RB 67 users: I just recently purchased a Sekor C 180 > mm for a Mamiya RB67. I find the behaviour of the "T" setting for long [quoted text clipped - 14 lines] > time > exactly. > To experienced Mamiya RB 67 users: I just recently purchased a Sekor C 180 > mm for a Mamiya RB67. I find the behaviour of the "T" setting for long [quoted text clipped - 14 lines] > time > exactly. I've got three Sekor C and that's how they work. I avoid exposure below 5-10 seconds. For astronomy I put the cap on the lens before pressing the lever to avoid a shaking trail. See page 22: http://66.49.230.119/mamiya_pdf/mamiya_rb67_pro-s-1.pdf Michel >> To experienced Mamiya RB 67 users: I just recently purchased a Sekor C >> 180 [quoted text clipped - 25 lines] > > Michel Good advice, however, there's no reason to avoid exposures below 5-10 seconds, as a little movement won't matter at that point, and if you're an instant too late or too early, that won't matter, either. >>> To experienced Mamiya RB 67 users: I just recently purchased a Sekor C >>> 180 [quoted text clipped - 29 lines] > seconds, as a little movement won't matter at that point, and if you're an > instant too late or too early, that won't matter, either. If there is no sudden change in brightness it is fine, but if you have a bright spot next to a dark area it's risky. A 0.1 second vibration on a 2 seconds exposure will show more than on a 10 seconds exposure. Michel Hermann Schaffer a écrit : > And this is what happens on "T" setting: operating the release button > opens the shutter. It is not possible to operate the release button > a second time to close the shutter again. That's normal. Same trouble with fixed lens Fuji690. Babar Thanks for the Information. In the meantime I got a copy of a handbook which confirms this behaviour. To close the shutter again I can either - 1) operate the rewind-shutter-lever for about 30 degrees or - 2) turn the time-setting-ring back to 1 second, which also closes the shutter. I find the idea with - 3) closing the lens with the lens-cap very valuable. Thanks and kindest regards - hermann schaffer - On Feb 16, 6:35 pm, "Hermann Schaffer" <hermann.schaf...@aon.at> wrote: > confirms this behaviour. To close the shutter again I can either - 1) > operate the rewind-shutter-lever for about 30 degrees or - 2) turn the > time-setting-ring back to 1 second, which also closes the shutter. I find > the idea with - 3) closing the lens with the lens-cap very valuable. Thanks > and kindest regards - hermann schaffer - use the metal film shade in the film back: just keep it on the edge of the entrance slot, then slide it in when you're done? works for me... don't use that under the sun, though: light might leak through the slot. You can also just "cap" the shutter with a hat or piece of dark card just like we did in 1907. Usually a 1/10 second camera movement at the end of a 10 second exposure is not going to hurt anything, especially if a good tripod is used. darkroommike > Thanks for the Information. In the meantime I got a copy of a handbook which > confirms this behaviour. To close the shutter again I can either - 1) > operate the rewind-shutter-lever for about 30 degrees or - 2) turn the > time-setting-ring back to 1 second, which also closes the shutter. I find > the idea with - 3) closing the lens with the lens-cap very valuable. Thanks > and kindest regards - hermann schaffer - > To experienced Mamiya RB 67 users: I just recently purchased a Sekor C 180 > mm for a Mamiya RB67. I find the behaviour of the "T" setting for long time [quoted text clipped - 6 lines] > a possibility to move the camera and it does not facilitate to stop the time > exactly. You use a black card to cover the lens. Trip the shutter, pull the black card away to expose and then move the black card back in front to end the exposure before winding the film and re-cocking the shutter. |
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