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Message: <blockquote data-quote="nickt" data-source="post: 508839" data-attributes="member: 4923">Just to say it another way, 50mm focal length is 50mm whether its dx or fx. The distance to the sensor plane is the same too whether dx or fx. The dx sensor is just smaller so any 'extra' image, falls outside the sensor and is not captured. That's why either lens will work fine on a dx camera. It might be less confusing to say the dx lens is cost reduced rather than optimized. If you were to put a dx lens on a fx camera, you would likely see vignetting. It was designed knowing the outer edges of the image would miss the dx sensor anyway.</blockquote>