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How a Shutter Works

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by signgrap on Sat Jan 31, 2015 8:50 am

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Informative slow-mo video of how an SLR shutter works.
http://www.dpreview.com/articles/798309 ... -10-000fps

Dick Ludwig

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by E.J. Peiker on Sat Jan 31, 2015 1:13 pm

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I describe this in my flash workshops when talking about flash sync. The fastest sync speed is the fastest speed where you have a moment in time when the entire sensor is uncovered. As soon as you get into the moving slot you have to use high speed sync which leaves the flash on (in a very fast pulsing mode) for the entire time of the exposure.

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by Scott Fairbairn on Sat Jan 31, 2015 4:27 pm

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you can certainly see how mirror and/or shutter bounce can cause soft images

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by E.J. Peiker on Sat Jan 31, 2015 4:34 pm

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Yup and it is at least part of the issue some are experiencing with the 7D2.
Top image, MLU on, silent shutter on, One shot focus, single frame mode:
Bottom image, 10FPS mode, AI Servo
100% crop, no post processing, or ACR sharpening. A single block from a building at 400 feet shot at 700mm with a perfectly focus calibrated body. Everything locked down hard... (Click on the image for a dark background to better see the effect)