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Message: <blockquote data-quote="BackdoorArts" data-source="post: 263586" data-attributes="member: 9240">Because the mathematics of a "1.5X sensor" imply the X-factor in magnification, but not in surface area.  An FX sensor is 36mm x 24mm, for a total of 864 sq. mm of surface area.A DX sensor is 23.7mm x 15.7mm, for a total of 372.1 sq mm of surface area.The ratio of sensor surface area is 372.1/864 or about .43.  So a DX sensor is 43% as large as an FX.  So, when you're talking MP's (or anything else regarding Nikon DX vs. FX in terms of sensor area) simply multiply the FX number by 0.43 to get the equivalent in a DX crop.  For the D600, that's 24 * .43, or 10.32 MP's.</blockquote>