Alan, Yes, my dad worked with Edgerton, Germehausen and H. E. Grier at Spalding making a lot of ultra high speed photos of Bobby Jones and Jimmy Thompson (among others) in the late 1930s. Dad was Director of Golf Research working under Lab Director J. Victor East at that time. Most of Edgerton's multiple strobe exposures of the golf swing were at 1/100,000 of a second with a 1/100 second interval. Two of these are in the BJ pics on John's Resource Page. Spalding also developed a machine to analyze and pull data from the photos (Stroke-ometer Graph method). I have some of this material in my files and have sent a few of BJs and JTs velocity and acceleration charts to Dave, Graham and a few others. If you would like any particular scans of any of this material, let me know. One of those sequences was of ball impact...showed ball was on face for .0004 seconds. That series of 8 pics is the last photo on the Clubmaker Online Resource Page BJ swing series (#12).
>Even at 1/1500 of a second exposure time, timed just at > impact, the shutter will be open for the entire impact/rebound process and > all you would see is a blur. Even blurred, it might show the shaft and hand position, which is what I think Graham was interested in seeing...if he can luck out on the timing and get the blurred shot just prior to impact. If he can shoot a video sequence on his camera, and starts shooting as the downswing starts, I think he'd have a better chance of getting one pic near impact than if he tried to time one shot by eyeball method. Have no idea what the downswing to impact time is, but if a whole swing tempo is about 1.4 seconds, the downswing could be about a quarter of a second? At 30 frames a second, he could get maybe four or five pics of the down swing? Don't know, but guess it would be fun to try. Bernie Writeto: [EMAIL PROTECTED]
