On Why the D850 is Revolutionary

Started Aug 12, 2017 | Discussions thread
syberman7 Senior Member • Posts: 1,076
Re: On Why the D850 is Revolutionary

bobn2 wrote:

syberman7 wrote:

bobn2 wrote:

Ferguson wrote:

I was hoping for something like 60 megapixels, really push the glass guys, and/or substantially better ISO or DR.

You do a quick calculation, you find that the pixels are the same size as the D500, so ten to a dozen, it shares the same pixel design and most other characteristics.

How do you calculate that? My arithmetic says a D500 sensor in FX size would be 48.4 MP.

D500 DX is 23.5mm x 15.7mm; 5568 px x 3712 px.

D500 sensor scaled to FX is 35.9mm x 24mm => 8506 px x 5686 px which is more than quoted spec of 45.75 MP and actually = 48.4 MP.

That eliminates D500 sensor at equal pixel pitch unless I have something wrong?

Not really. The D500 pixel is 4.22 micron. If we assume that the D850 is 8280x5520 that gives a pitch of 4.33 microns. It's highly likely that within that boundary, the pixel design is exactly the same, there is just a slightly larger spacing on the D850 sensor. Exactly the same happened in the D7000 -> D800. It's unlikely that two completely separate pixel designs were used for each, especially given the way that Sony lays out its pixels.

So are you saying the actual light collecting wells are the same pitch, but they are spaced more widely? Does this mean that the microlens layer compensates by focusing more light in each pixel?

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