The REALITY of Pixel Density (size) and the myth of the crop factor. Locked

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EdnaBambrick
Regular MemberPosts: 268Gear list
The REALITY of Pixel Density (size) and the myth of the crop factor.
10 months ago

OK - so I trolled a little* just to get the excitement level up. 

Here's the reality (as the math will show you)

There is a 'reach advantage' in pixel density when comparing the same size sensors.

But it's NOT according to sensor size.  It is according to pixel size.

For this reason the NEX5 16mp with pixel pitch of 5.07 um and the A7r with pixel pitch of 4.86 um make the approximately same sized photos with the same lens once cropped.  There is NO reach advantage.  1.5x or otherwise. (a slight disadvantage actually)

But when one compares the A7r (or the 5) with the smaller photosites of the NEX7 there is a difference in the outputs.  Sorry to disappoint again but it is NOT 1.5x either.

The NEX7 has a pitch of 3.88 um resulting in about a 25% reach advantage.  THIS IS DUE TO PIXEL DENSITY and not crop factor.  And certainly not as so many believe a 300mm is like a 450mm just because it's on an APSc.

You can forget about sensor size and only need to know pixel size to figure out how much REACH advantage one sensor has over the other.

Pixel sizes and density make the difference - not crop factors

*The NEX7 crop was actually a NEX5 crop in the earlier thread.

 EdnaBambrick's gear list:EdnaBambrick's gear list
Sony Alpha NEX-7 Carl Zeiss Distagon T* 2,8/21 Carl Zeiss Distagon T* 2/28 Carl Zeiss Distagon T* 1,4/35 Carl Zeiss Planar T* 1,4/50 +6 more
Sony Alpha 7R Sony Alpha NEX-5 Sony Alpha NEX-7
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