Why EVF will never replace OVF for me

Started 11 months ago | Discussions thread
Erik Magnuson
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Non-destructive read or image stacking?
In reply to nigelht, 11 months ago

nigelht wrote:

Every 1/24th of a second (or whatever desired refresh rate) I can show the image produced by integrating over the prior 10 seconds of time.

This requires that you can do a non-destructive read of the pixel voltages. I did not think contemporary sensors could do this.

The olympus OMD "live time" long exposure feature can kinda sorta do this. [5][6] Since you can get up to 24 previews then for a 12 second exposure you can get a preview every half second. It's not a constant refresh but it's a more useful feature the way it's done. I wish more cameras could do this.

Given the timings involved, I suspect Olympus is basically doing in-camera image stacking, i.e. every 0.5s the sensor is read (and reset) and the values are simply added added together to update the display or the cumulative exposure.  If they could do an actual non-destructive read, then there would be no need to restrict the time of the updates to 0.5s.

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Erik

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