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Message: <blockquote data-quote="Eye-level" data-source="post: 77018" data-attributes="member: 6548">I had forgot about this.  Basically all you do make a series of tests on an evenly lighted wall.  For example f/2.5 1000, f/4 500, f/5.6 250, f/8 125, f/11 60, f/16 30 using ISO 200.  All of the exposures should be identical.  Then you run some series using each shutter speed and go through all the stops.  Eg.  f/2.5 30, f/2.5 60, f/2.5 125, f/2.5 250, etc.  then go to the next stop f/4 30, f/4 60, f/4 125, etc.  This series should make for some nice uniform patterns.  If a shutter speed is out of whack it is going to show up with these tests.  I do not know if this would be useful for DSLR's but this is one method of testing shutter speeds in old mechanical film cameras.</blockquote>