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Message: <blockquote data-quote="Marcel" data-source="post: 28090" data-attributes="member: 3903">You are right on. What they mean is that if let's say you had two camera side by side, one FX and the other DX. Now you want to have a very particular cropping that would cover just a door and a window for example and it would be very important that you exclude everything around it.In order to have the exact same content on the DX and FX sensor, you would need to have a 1.5 longer lens on the FX than the DX ( 75mm vs 50mm). So this is why they say that the 50 mm on DX is equivalent to 75 on FX. But the fact remains that the 50 mm lens is still 50 mm and will have all the DOF of a 50mm lens for a certain aperture.Hope this clarifies it for you.</blockquote>