On Sharpness, ISO and Shutter Speed

Started Nov 29, 2013 | Discussions thread
OP Jack Hogan Veteran Member • Posts: 6,703
Re: good idea, change light level to get different shutter speeds

RussellInCincinnati wrote: Hope nobody reading this thread thinks that shutter shock has any practical significance.

Well, I don't know whether what we are seeing is shutter shock, that is just one of a number of possibilities.

This thread exposes that we have to get to a test bench to see even a 10% change in resolution. How in an ordinary world scene would somebody ever notice this in anything but extreme telephoto work, when even then the variables of what camera you have, what lens you have, what aperture you're using, accuracy and depth of focus, post-processing noise reduction, lens field curvature, inherent scene contrast and "edginess", post-processing sharpening, light level and effective sensor ISO, overall camera shake, presence or absence of various kinds of stabilization, flare level and subject movement will in all likelihood overwhelm "shutter shock" effects.

True. Although some of us use a tripod for many of our captures and work with perfectly still subjets (landscapes;-). So after seeing some surprises in the curves, the first question that came to my mind was 'is my technique better than DPR's? Followed by 'should I be attempting to avoid certain shutter speeds, when going for maximum resolution? - maybe I should run a few tests with my camera and my setup'.

We can only speculate at this stage, so it would be best to leave it to someone who can do proper targeted testing as far as these cameras are concerned. But since this is the first time that I have seen curves like this I thought others may find them interesting and possibly help explain some of the anomalies.


PS/OT I have now seen a number of the images you've taken with your C3 in various posts. They all appear to have a color cast and be underexposed/underbrightened on my calibrated/profiled monitor. Are these images right OOC or are you converting them yourself? And if the latter, what are the brightness and contrast settings of your monitor? I would guess both to be too high.

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