Shutter Shock: My ep5 is bad. Would an em5 do better?

Started 11 months ago | Discussions thread
Anders W
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Re: More test data with various settings, noticeable improvement.
In reply to lester11, 11 months ago

lester11 wrote:

Steen Bay wrote:

Still find it a bit confusing. Can the first curtain be 'cocked' before it's closed to prepere the exposure? Or maybe it's just the second curtain that's 'cocked' beforehand?

I tried an analysis of shutter action here

http://www.dpreview.com/forums/post/52447334

but am not entirely convinced that it is a complete account.

What is reasonably clear is that the "release short" setting cocks and then holds the shutter open electromagnetically in preparation for the next shot by taking a (high noise high vibration)mechanical action immediately after the previous shot rather than at the start of the current shot. So the current shot can then take place both more quickly and with less vibration.

But what is not clear is why this might reduce shutter shock, since the lower vibrations due to the electromechanical (rather than entirely mechanical) shutter hold are probably finished by the time the next vibration burst occurs, which is the closing of the shutter prior to the release of the first curtain... These vibrations are in action during the entire time that the shutter is supposedly open for the exposure.

I agree that it is not self-evident for what reasons setting release lag-time to short might reduce the blur due to shutter shock. As you suggest, the motion due to charging the shutter (which is moved from the beginning to the end of the shutter sequence when release lag-time is set to short) might be sufficiently distant in time from the actual exposure not to matter even when it occurs immediately before rather than immediately after exposure. What one must keep in mind here, however, is that if the entire camera is displaced in the flesh of your hands, the time it takes for the flesh to resume its original shape might potentially be rather long.

It is easier to see why the 1/8" (or whatever) anti-shock reduces shutter shock. The setting helps by allowing the settling of the shutter closing before the first curtain is released, so that the "only" vibrations affecting the image are due to first curtain release.

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Lester

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