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Message: <blockquote data-quote="nickt" data-source="post: 543587" data-attributes="member: 4923">No, 300mm is 300mm. A dx lens is just made less expensively. If you use a fx lens on dx, the extra image is cast outside the sensor. Extra glass and design work wasted. The dx lens doesn't design for the larger sensor, so less glass and cheap. the image cast is still the same as far as the dx sensor is concerned.edit: just to clarify, you get the 1.5 effect on a crop sensor with either fx or dx lens.</blockquote>