Archived posting to the Leica Users Group, 2019/08/14
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]next thing you know, you?ll be adapting a flatbed scanner and Graflock back on the thing;^_ ric carter > On Aug 14, 2019, at 1:40 PM, Peter Dzwig <pdzwig at summaventures.com> > wrote: > > Fascinating. Thank you for posting such a detailed response. I wonder > what its makers would have thought of your ingenuity. > > Peter > > On 13/08/2019 23:20, Alan Magayne-Roshak wrote: >> Peter Dzwig asked me about putting X-Synch on my ca. 1917 4x5 RB >> (Revolving >> Back) Graflex. >> Here's the story. >> >> The camera that I bought to go with my 9" f/4 Wollensak Verito Diffused >> Focus lens that I got for $12.00 in 1985: >> < >> http://gallery.leica-users.org/v/Alan+Magayne-Roshak/Gear/MR_Graflex_1_Orig.jpg.html >>> >> >> Side view showing the wiring path: >> < >> http://gallery.leica-users.org/v/Alan+Magayne-Roshak/Gear/MR_Graflex_2_X-Synch.jpg.html >>> >> The Graflex has a focal plane shutter with multiple slits and spring >> tensions. When the shutter is set to "O" (for open) the film >> plane is uncovered but the mirror blocks light from exposing the film. >> With >> a high tension, when the shutter button is pressed, the >> mirror flips out of the way, trips the shutter, the entire film area is >> exposed for a fraction of a second, and then the shutter curtain comes >> down >> and covers the focal plane. I made some contacts out of Aurora HO-scale >> slot car pick-ups and mounted them so that the one on the mirror reset >> lever would strike the stationary one at the moment after the mirror was >> up, but before the shutter >> curtain comes down to cover the film. I can adjust the timing by >> loosening >> the set screw on the arm, and varying the angle >> of the moving contact. The wire ends in a standard PC fitting. The lead >> going down and inside is for the microswitch in >> picture five. >> >> Closer view with mirror down and shutter cocked: >> < >> http://gallery.leica-users.org/v/Alan+Magayne-Roshak/Gear/MR_Graflex_3_X-Synch.jpg.html >>> >> >> Closer view with mirror up and shutter tripped: >> < >> http://gallery.leica-users.org/v/Alan+Magayne-Roshak/Gear/MR_Graflex_4_X-Synch.jpg.html >>> >> >> If I didn't do anything more, the flash would fire again as I reset the >> mirror lever for viewing, so in the mirror box I >> added a microswitch that only completes the circuit when the >> mirror/shutter >> release lever pushes against it. When the shutter >> button is released, the switch opens the circuit and the external mirror >> reset lever can swing past the stationary contact without >> setting off the flash. >> >> Microswitch and internal mirror release lever: >> < >> http://gallery.leica-users.org/v/Alan+Magayne-Roshak/Gear/MR_Graflex_5_X-Synch.jpg.html >>> >> >> I usually like to use this camera with a Graflex 2-1/4 x 3-1/4 roll film >> back, so when I'm employing electronic flash, I have >> to do this for every shot (except the dark slide only needs to be pulled >> at >> the start and pushed in at the end of the roll). >> >> 1. Have shutter set to "O" and mirror down. >> 2. Focus and compose (remembering to orient the roll film back to match >> rectangles for vertical and horizontal shots drawn on the ground glass). >> 3. Trip shutter. >> 4. Wind film to next frame (there's no double-exposure prevention). >> 5. Reset mirror to viewing position. >> 6. Rewind shutter to "O" position. >> 7. Steps 2, 3, 4, 5, & 6 for each of the remaining seven frames. >> >> Simple. >> - >> Alan >> >> Alan Magayne-Roshak, Senior Photographer >> University of Wisconsin-Milwaukee Photo Services >> (Retired) >> UPAA Photographer of the Year 1978 >> UPAA Master of the Profession 2014 >> amr3 at uwm.edu >> http://gallery.leica-users.org/v/Alan+Magayne-Roshak/ >> >> "All the technique in the world doesn't compensate >> for an inability to notice. " - Elliott Erwitt >> >> _______________________________________________ >> Leica Users Group. >> See http://leica-users.org/mailman/listinfo/lug for more information >> > > -- > > Dr. Peter Dzwig > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information