On Why the D850 is Revolutionary

Started Aug 12, 2017 | Discussions thread
bobn2 Forum Pro • Posts: 59,019
Re: On Why the D850 is Revolutionary

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.

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