Posted by Pete Gregar on April 27, 2001 at 13:18:06:
In Reply to: Re: Checking of Focal Plane shutter is accurate? posted by Les on April 27, 2001 at 12:03:28:What is a calumet tester?? Are these expensive?
Maybe I should just shoot some pictures and see the results..
Do I need to make any exposure adjustments when using it vs the lens shutter?
thanks!
: The slow speeds definitely go first and while a typical digital shutter tester can spot check the speed, it's common for the speed of the curtain (and thus the exposure) to vary from top to bottom.
: On most of th eminispeeds I"ve had, a tension of 1 and a T exposure usually resulted in the shutter opening rather quickly and slowing down before wide open hit. When closing (firing on O) most would start to close and then p oop out. At the other end of the scale once the shutter takes of from a dead start, it's common to find the top of the image under exposed (the image is inverted) because of interia.
: there are oscillo scope machines designed to graph the velocity of the shutter, but these are expensive and are only found in major repair facilities.
: The biggest culprit is leaving the wound up. I always set the tension to 1 and leave the shutter to O when not using it.
: I usually test mine with a Calumet tester in the center, then assume the sky will get under exposed which brings out the clouds and the grass will get overexposed which brings out shadow detail.