Why EVF will never replace OVF for me

Started Jan 14, 2014 | Discussions thread
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Erik Magnuson Forum Pro • Posts: 12,247
Re: Non-destructive read or image stacking?

nigelht wrote:

I don't know what the current sensors do but you can build CMOS sensors with non-destructive read.

IIRC the cost in light sensitive area was high due to the extra circuitry required - similar to why global electronic shutters are not common.

That seems a likely possibility. That would explain why they limit the number of previews as readout noise would all get added together.

If it takes 1/16th of a second to read the sensor (similar to the Panasonic electronic shutter time), then sampling at mose every .5s means you don't notice any exposure differential in the preview between top and bottom (or side to side) as it's only 1/8 of a stop delta on the 0.5s exposure.

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Erik

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