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Message: <blockquote data-quote="aroy" data-source="post: 339340" data-attributes="member: 16090">1:1 means that a 20mm object will be 20mm on the sensor. The DX sensor is 24mm wide while the FX sensor is 36mm wide. So a 36mm object will just fit the FX sensor, but overflow the DX sensor - 6mm on each side (if you centered it) will be cropped.The same applies to all lenses. If the magnification of a telephoto is 1:0.01 (that 1/100), then a 1 meter object will be 1cm on the sensor, and 2.4m will be 2.4cm = 24mm : full DX width. If both DX and FX have same number of pixels - 24MP, then 24mm on DX will take up 6000 pixels while in FX it will take 4000 pixels, hence DX will appear to have magnified the image (assuming same number of pixels per print/display) by 1.5 times. This is where the confusion starts.</blockquote>