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

Started 6 months ago | Discussions thread
Anders W
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Re: More test data with various settings, noticeable improvement.
In reply to skyglider, 6 months ago

skyglider wrote:

Anders W wrote:

Mr Sincere wrote:

I quickly ran through some more settings (it's nice out, and I gotta get out and shoot something other than candy bar wrappers ).

Quick summary:

IS 1 vs IS Auto: Makes no difference. Didn't think it would, but thought it couldn't hurt to try.

Short Shutter Release: For some reason, enabling this creates a huge improvement. Does anyone have any idea why this might be? I can hear a click when I enable this, which makes me think it changes something mechanical. This improvement alone could almost be enough to make me keep the camera.

Judging by the evidence presented here

http://www.dpreview.com/forums/post/52306602

the shutter is "cocked" immediately after each exposure when release lag-time is set to short, so that the camera is already prepared to release the shutter again. If it is set to normal, the shutter is instead "cocked" immediately before the exposure. Possibly, the motion associated with the "cocking" operation is sufficiently "violent" to affect the exposure if carried out immediately prior to it.

I put "cock" in quotation marks since the shutters we are talking about here are not spring-loaded (as far as I know). Nevertheless, it seems that the actuator has to be prepared in some way before it can do the job.

Hi Anders W,

Could you expand on your explanation above? I thought that mirrorless cameras have to keep the shutter open in order to display the scene on the screen or in the view finder.

You are perfectly right about that.

If the shutter is cocked immediately after each exposure, then wouldn't the shutter then be blocking the light negating live display on the screen or viewfinder?

By "cocking" I mean "preparing the shutter for action". Even if shutters are no longer spring-loaded but driven by coreless micro motors (if this Wikipedia article is correct), it seems as if some preparatory steps must be taken before the shutter can go into action. Judging by the post I linked to in my reply to the OP, the difference between short and normal "release lag-time" is that with short, this preparation is done immediately after each exposure, before the shutter button is pressed for the next shot, whereas with normal, it is done right after the shutter button is pressed and right before the exposure.

I'm just really interested in learning how the "short shutter release" actually works.

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