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Message: <blockquote data-quote="WayneF" data-source="post: 383838" data-attributes="member: 12496">Well, the D7100 image size is 6000x4000 pixels (24 megapixels).The D700 image size is 4256x2832 pixels (12 megapixels)The D700 image cropped to DX size (by the D700 mode) is 2784x1848 pixels (5.1 megapixels, about 40%)I don't know the size of your computers video monitor, but let's guess midsize, maybe 1680x1050 pixels just for some number.The window size of your photo viewer would be smaller than that... less than 2 megapixels.Exact size is unimportant here, but the point is, the images are much larger than the screen, any video screen.So, all three of those images are too large for the screen, so all have to be resampled smaller to fit on the the screen.That is a big equalizer, when resampled to near same size.  <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" />   It discards most of the pixels, leaving only enough pixels to fit the screen size.    But it does not represent the maximum capability of the images, if you could view them full size.If we were going to print them, at 300 pixels per inch,the D7100 image prints 20 x 13.3 inchesThe D700 FX image prints 14.2 x 9.4 inchesThe D700 DX image prints 9.3 x 6.2 inches (about 2/3 FX size, when enlarged to the same 300 pixel per inch dimension)Now from the above, we can imagine that the 24 megapixels have so much resolution that it can obviously print at about 1.4x dimensions more than the 12 megapixel FX. But again, printing is just a digital reproduction, of that distant lens image (which the DX image was smaller, 2/3 of the mm dimensions).So think back to that "same lens at same distance on both bodies" example, and we realize both have to be exactly the same image and same image quality, the DX is just cropped smaller. Both D7100 and DX from D700 are cropped to the same size (in mm dimension), but smaller than the FX image (mm size). But the D7100 copies it to digital with more pixels.    And that DX image has to be enlarged half again more just to be same size, and the 24 mp printed image has to be enlarged nearly 2x to be the 41% larger than equal size.    So, since enlarged 2x more, then by definition, this original lens/sensor image reproduction now has only half the resolution of the larger FX image.  It has twice the megapixels to try to copy and reproduce that detail, but the image it is copying is smaller (and in this example, it is copied even larger).Enlargement directly reduces resolution.  And again, pixel resolution is only trying to copy the original lens resolution.  It cannot increase it. Starting big is a good thing.  Not that FX is so big, but that is the idea behind the larger sheet film sizes.</blockquote>

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