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Message: <blockquote data-quote="aroy" data-source="post: 329228" data-attributes="member: 16090">Another thing we forget is the perspective. If you shoot with say 50mm from 20m away, the perspective remains same in both the formats, but DX frame is smaller (cropped). Now use the same lense (assuming it has a large enough image circle) on a MF camera, the image frame is larger than FX.When you want the same FOV in different sized sensors, you use an "equivalent" lense - approximately . 35mm for DX. 50mm for FX. 80mm for MFThe moment you change the focal length, you are changing the perspective. So even if the fore ground or the main subject has the same FOV, due to change in perspective rest on the image is different. Try to shoot trees in a sparsely populated (with trees) forest and you will see the change in perspective shifts the trees ahead and behind those in focus. Two images simply do not overlap.Where the effect of perspective is barely visible is in long telephotos (the difference in angle is very little) and in macros (the background is blurred due to shallow DOF).Where the DX sensor gains is in the pixel density. For 24MP sensor the densities are. DX : 250/mm. FX : 166.6/mmSo if the image on the sensor is 10mm, it will have 2500 pixels in DX and 1667 in FX. You get more details in DX. A pretty good difference, which means the DX will do with less magnification to show the same detail.</blockquote>