Panasonic GH3 review published

Started Apr 15, 2013 | Discussions thread
Anders W
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Re: Panasonic GH3 review
In reply to RicksAstro, Apr 16, 2013

RicksAstro wrote:

Anders W wrote:

As I pointed out, it's just a matter of how quickly the sensor can be reset. Presumably, Canon can't patent the reset speed itself, just a particular way of accomplishing it. If Sony has accomplished the same by some other means, they wouldn't have to license it.

I thought it wasn't just how fast it can be reset, but a matter of syncing the resetting of each row with the mechanical shutter (same speed and direction) so no mechanical shutter is needed.    That may be patentable.

I doubt that this makes a difference with regard to patentability. If you have a reset mechanism, no matter which, it should be addressable by row (if the sensor is read by row). And if it is addressable by row, it is of course a simple matter to sync it with the shutter curtain.

I suppose speed is still the limiting factor since the GH3's electronic shutter's speed is only 0.1s.

Yes, reset speed is surely the limiting factor. The electronic shutter on the G5 and GH3 takes 0.1s to finish the entire sensor because the read-out speed is limited. In all likelihood, the sensor in these cameras can be reset (i.e., the wells emptied without being read or read in a sloppy fashion with more noise or read only partially) at a faster pace than that. How could we otherwise have EVF/LCD and AF rates far faster than 10 Hz? But presumably, the process is not yet fast enough for an electronic first curtain.

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