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Message: <blockquote data-quote="RocketCowboy" data-source="post: 519323" data-attributes="member: 25095">Remember, sensor size isn't changing anything about the actual geometry of the lightbox inside the camera body. The focal length is the same, aperture (f/4, for instance) is still aperture, and shutter speed is shutter speed. The only difference between DX and FX is the size of the sensor and consequently the size of the image taken from all the light that passes through the lens and camera. Because DX takes a smaller image from the total available light, there is a smaller field of view which is what creates that "effective focal length" or crop effect, but the physics otherwise are identical.</blockquote>