Originally posted by Debonair
eskimo, when u did the flim hi-spped photos, did you experience any reciprocity law failure (i.e. film not responding the same to 1/8000th@f/4 vs. 1/32000th@f/2)?
I took the Spam shots in 1990 or 91. I had an expired 100’ roll of 400 speed BW film that I used for the semester I shot food. I bought a Vivitar Thyristor 283 Zoom flash (I think that’s what it was) just for the project. I altered it so it would always flash at its shortest setting which was 1/30,000 second. I didn’t really work any light/film speed settings, I just mounted the flash as close to the subject as possible without it being in the actual frame. The film was pretty under exposed, so I altered the film processing time and worked with what I had in the dark room. It was really more of a trial and error process, but I always got something. B & W film is pretty forgiving that way.
One thing that I did that saved a lot of cost and trouble was my flash trigger. Edgerton and other imitators used microphones and amps and an electronic switch (or infrared) as a switch. I used aluminum foil… that’s it! I cut the middle out of three playing cards and put foil between them (and made sure the foil didn’t touch). I held them together with clothes pins and clipped alligator clips to the two pieces of foil. The other ends of the leads were hooked up to the flash of course. So the bullet would go through the food (or whatever) and then would pass through the foil making an electrical connection which would set off the flash. It was remarkably simple, cheap and reliable. The only problem I ever encountered was about 1 in 20 shots would be a double exposure; sometimes the foil would touch, separate for an instant then touch again. I could replace the foil in the switch in seconds. Sometimes shrapnel would destroy the switch, but a new one was only three playing cards and a minute away. You can see the switch in the potato picture.
I’m thinking about doing it again with my digital camera… I’ve been studying flashes trying to figure out what can put out some good quick light.