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<blockquote data-quote="480sparky" data-source="post: 229591" data-attributes="member: 15805">The only difference between an FX lens and a DX lens is the size of the image projected.&nbsp; DX lenses are designed to cover the smaller crop sensors.&nbsp; But the subjects they project are the same.Here's a 50mm DX lens on a full-frame camera:<img src="http://i214.photobucket.com/albums/cc172/480sparky/Photography/DSC_0252.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />Here's a 50mm FX lens:<img src="http://i214.photobucket.com/albums/cc172/480sparky/Photography/DSC_0253.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />Notice everything is the same size?&nbsp; That's because they're both taken with a 50mm lens.<img src="http://i214.photobucket.com/albums/cc172/480sparky/Photography/DSC_0252A.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />A DX-format lens only needs to project an image large enough to cover the smaller sensor.&nbsp; An FX-format lens needs a larger 'circle' to cover the full 24x36mm sensor.&nbsp; This is because a DX-format sensor is physically smaller than an FX one.<img src="http://i214.photobucket.com/albums/cc172/480sparky/Photography/FXsbsDXSensorsPost.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />What will change, if you put that 70-300 on an FX body, is your field of view.&nbsp; Not the focal length. The FOV will be wider.</blockquote>

[QUOTE="480sparky, post: 229591, member: 15805"] The only difference between an FX lens and a DX lens is the size of the image projected. DX lenses are designed to cover the smaller crop sensors. But the subjects they project are the same. Here's a 50mm DX lens on a full-frame camera: [IMG]http://i214.photobucket.com/albums/cc172/480sparky/Photography/DSC_0252.jpg[/IMG] Here's a 50mm FX lens: [IMG]http://i214.photobucket.com/albums/cc172/480sparky/Photography/DSC_0253.jpg[/IMG] Notice everything is the same size? That's because they're both taken with a 50mm lens. [IMG]http://i214.photobucket.com/albums/cc172/480sparky/Photography/DSC_0252A.jpg[/IMG] A DX-format lens only needs to project an image large enough to cover the smaller sensor. An FX-format lens needs a larger 'circle' to cover the full 24x36mm sensor. This is because a DX-format sensor is [I]physically smaller[/I] than an FX one. [IMG]http://i214.photobucket.com/albums/cc172/480sparky/Photography/FXsbsDXSensorsPost.jpg[/IMG] What will change, if you put that 70-300 on an FX body, is your[I] field of view[/I]. [B]Not[/B] the focal length. The FOV will be wider. [/QUOTE]

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