adam_koch

<p>I know this tread is very dead but I ran across while searching if anyone knew of a manufacturer of flash triggering devices for high speed photography and I felt like clarifying some things, anyway to get to the point... <br /> <br /> Edgerton used a microphone and a home-built device to trigger a strobe (sometimes he used a photoelectric cell and a light beam) based on the report of the weapon, he left the shutter open in a pitch black room. Gun fires, mic picks up the crack of the shot, flash fires room goes back to black. The hardest part is actually positioning the mic since most rounds are super-sonic the bullet hits the target before the actual report makes it to the target, luckily calculating ballistics is easy, well at least nowadays.<br /> <br /> Off-topic but nonetheless interesting.</p>

<p>I know this is a dead thread but I have been on haitus from my mamiya for a while, I bent the leaf springs on the back out a bit and I no longer have the skipping frames or the dead space on the roll. <br /> <br /> Thanks fellas, Adam.</p>

<p>Thanks for the responses. <br /> <br /> Joe: That is indeed part of the second to last frame that was chopped off. I always line up the film dead on the start mark of the insert. Some rolls have only small spacing problems like 1 frame skipped or just uneven spacing but some rolls like the one above are just a mess. Oddly enough whenever I have shot with ilford film the spacing seems to be less of a problem, that might just be a coincidence though.<br /> <br /> I will check all those parts you indicated and I'll order another insert, doesn't hurt to have a backup anyway.</p>

<p>I am having a strange problem with my 645 Super, I'll shoot a roll of 120 and when I go to develop the roll I end up with large portions of the roll completely blank however the amount of frames skipped seems to vary between 2 - 6 per roll (see image below). <br /> <br /> I checked all the gears in the back to see if any of the teeth were worn or broken and all looks well, when I go to forward the roll the winder arm seems to slip sometimes I have tried to wind slower and with even tension but it doesn't help.<br /> <br /> Any ideas? Maybe I just need a new back?<br /> <br /> Thanks in advance, Adam.<br>

<img src="http://img134.imageshack.us/img134/2552/mamiya.jpg" alt="" /></p>