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Re:High speed Tesla spark photographs



Original poster: Russell L Thornton <Russell.L.Thornton@xxxxxxxx>


Thanks Gary and Terry. I am a little more informed but just barely. Gary, what is a FRES? I could not find a def that fit on the web. Also, I can see a little better why the streaking is minimal. I think you are assuming that you are catching just one spark strike since more than one in a single pass of the mirror at 5000 RPM ( = 1/83 second shutter speed) would show parallel sparks along the smear. I have seen photos of lightning where the camera is rotated in azimuth during a single exposure and the film captures multiple strikes. That being the case now that you have convinced yourself that at a single mirror RPM of 5000 delivers you a single strike the shutter speed is now basically somewhere between 1/60 and 1/125. Why don't you just shoot direct and eliminate the mirror and smearing? Or am I still confused?

Russ