On 5/15/12, Gerhard Fuernkranz <nospam456@xxxxxx> wrote: > I would wonder though, how accurate various cameras can realize the > prescribed f-stops and shutter speeds, how well they are repeatable, and how > uniform the steps between different adjacent f-stops and shutter speed are > distributed in reality. > > [ Maybe someone here on the list has experience regarding f-stop and shutter > speed accuracy of typical cameras and can give some numbers? ] I've never seen tests on shutter-speed accuracy alone. But several years ago I looked into how to test for sensor linearity. Of course what can be done without a laboratory and special equipment is a test of the whole system, sensor+lens+shutter speed+ etc. If the data is linear, one can assume all the parts are working as expected. Otherwise, the question is where is the nonlinearity coming from. You might find the following references interesting: http://www.clarkvision.com/articles/evaluation-1d2/ http://www.clarkvision.com/articles/evaluation-nikon-d200/index.html http://www.brisk.org.uk/photog/d3respiso200.html http://www.brisk.org.uk/photog/5drespiso100.html color.psych.upenn.edu/brainard/papers/Brainard39.pdf http://www.vinland.com/Linearity.html flare: http://www.vinland.com/Contrast.html Elle -- Elle Stone http://ninedegreesbelow.com
