The Sony A7s - Birders' dream camera?

Started Jun 5, 2014 | Discussions thread
parallaxproblem Veteran Member • Posts: 5,335
Re: The Sony A7s - Birders' dream camera?

GaryW wrote:

parallaxproblem wrote:...

After a long discussion on this subject with Jay Ell it would appear that in most cases resizing a high MP sensor image to the same size as a lower MP sensor image will have a very similar noise profile to that shown on the low MP sensor as 'shot noise' is a much more significant component of sensor noise than 'read noise':

http://www.dpreview.com/forums/post/52714686

This makes one wonder if the 'excellent noise response from low MP sensor' which the A7s is proposing is simply a marketing trick and whether we would get the same results from a 36MP sensor image downsized to a 12MP equivalent

Was t this the case between the Nex-7 and the 16mp Nexes? But there were always those complaining that the Nex-7 was noisier. Certainly at 100% views, but that's hardly a fair comparison.

There were several comparisons on the A-mount forum between resized 24MP sensor outputs from A77/A65, and the equivalent 16MP bodies and the results seemed to suggest that noise was not that different on a like-for-like basis (the 24MP still being slightly noisier when downsized, but not by much)

Of course, having a 16MP sensor instead of a 24MP sensor offers benefits in terms of how quickly the files can be written to your memory card (smaller files from the 16MP sensor going quicker) and consequently can be better for high frame rates and fewer 'full' buffers (older Sony cameras not being terribly generous on buffer size, and have a bad habit of 'locking' when the buffer full until it is clear)

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