Vibration of the A7R shutter compared to D3 and NEX-7 using a seismometer

Started Dec 20, 2013 | Discussions thread
Horshack Veteran Member • Posts: 7,922
Re: Yes it was too harsh

ferrellmc wrote:

A possible way to test shutter vibration and eliminate the variables would be to take an image with shutter vibration and then compare it to an image without shutter vibration.

To take the image with NO shutter vibration have the camera set up in a dark studio, open the shutter for say 10-20seconds. While the shutter is open fire a strobe(s) off camera to expose the image. This exposure will have no vibration from a shutter release.

Then take an image normally but don't use the strobes their duration is too short, use hot lights or similar.

If everything is the same: lens, focus, ISO, tripod mount, distance etc. the difference in the two images is shutter vibration. Then do the MTF mapper (I've never worked with it).

This could be done at different shutter speeds.

I actually considered this a while back but then realized it's not a valid test because the duration of the flash strobe is only a handful of milliseconds, so its effective shutter speed is very high.

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