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

Started Jan 10, 2014 | Discussions thread
Flat view
This thread is locked.
EdnaBambrick Contributing Member • Posts: 776
The REALITY of Pixel Density (size) and the myth of the crop factor.

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
Nikon D810 Nikon D850 Nikon AF-S Nikkor 14-24mm f/2.8G ED Nikon AF-S Nikkor 70-200mm f/2.8G ED VR II Nikon AF-S Nikkor 300mm f/2.8G ED VR II +5 more
Sony Alpha a7R Sony Alpha NEX-5 Sony Alpha NEX-7
If you believe there are incorrect tags, please send us this post using our feedback form.
Flat view
Post (hide subjects) Posted by
(unknown member)
(unknown member)
(unknown member)
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark MMy threads
Color scheme? Blue / Yellow