Let me ask, why do you want 1/500 speed ?
You can measure actual shutter speed with a shutter tester. This would cost from $15 to $99 at ebay. The cheap ones are a bare photocell that see through the lens, and it is conected to a PC sound input, from the wave you calculate the time. I use that way, but instead comecting it to the sound input I use an USB oscilloscope.
For having a right exposure the important thing is measuring the actual speeds (and you do with that) and checking the shutter always repeats the same time. This is specially important to shot slides, negative film (IMHO) has more margin for errors than with slides.
http://www.kenrockwell.com/tech/expo...rge-format.htm
For studio shots you can use strobes, this would ensure the image is perfectly frozen as your exposure time in practice is ultra short (can be 1/30000 sometimes).
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