You have to do the calibrating. For instance my old Graphex shutter on the Press Camera is consistent to within 1/6 stop (checking 10-12 times for each speed) but is quite a bit off the marked speeds, a modern electrically timed shutter should be much more consistant. My incident meter reads to 1/10 stop and is consistent +- one mark. If your film needs are critical you buy large quantities of the same emulsion number, and store it in the freezer after testing a few rolls. You also have to do your own developing to achive consistant processing. All that being said, I never worked to those levels of accuracy. 1/2 stop is fine for my critical needs, and 1 stop for general photography.
So, in a way you are correct, you can not achive that kind of accuracy off the shelf, but it can be done. Ciao, Graywolf http://pages.prodigy.net/graywolfphoto ----- Original Message ----- From: "J. C. O'Connell" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Wednesday, June 11, 2003 4:45 PM Subject: RE: Exposure > I dont believe that any 35mm SLR shutters and apertures > are calibratable to that degree of accuracy at ALL > settings. Secondly there are additional errors of > consistancy even if you could calibrate a given > setting's AVERAGE value to perfection.
