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<blockquote data-quote="Mike D90" data-source="post: 229784" data-attributes="member: 17556">I still do not really understand this.If both lenses are the same, with respect to actual focal length and angle, what is different about the DX lens build that changes what it does for either camera?&nbsp; &nbsp; What I think the DX lens does is it just reduces the size of the light path that hits the sensor.&nbsp; Basically it crops the image down to the DX sensor size.&nbsp; If this is the case then it makes no sense as to why they did that.&nbsp; Is that even necessary?&nbsp; If the camera sensor crops the image then why would the lens need to do this?If I am even close to understanding this at all it would seem to me that, if I wanted the exact same photo from both camera types, I would have to move the DX camera farther away from the subject to get the same image as the FX camera.&nbsp; Since the DX sensor crops the photo then moving back would be the only way to get the same exact frame fill as the FX camera would get.&nbsp; The only other way I can understand to do it would be to use a lens with a shorter focal length on the DX camera.&nbsp; But this should change the perspective on the DX image.</blockquote>

[QUOTE="Mike D90, post: 229784, member: 17556"] I still do not really understand this. If both lenses are the same, with respect to actual focal length and angle, what is different about the DX lens build that changes what it does for either camera? What I think the DX lens does is it just reduces the size of the light path that hits the sensor. Basically it crops the image down to the DX sensor size. If this is the case then it makes no sense as to why they did that. Is that even necessary? If the camera sensor crops the image then why would the lens need to do this? If I am even close to understanding this at all it would seem to me that, if I wanted the exact same photo from both camera types, I would have to move the DX camera farther away from the subject to get the same image as the FX camera. Since the DX sensor crops the photo then moving back would be the only way to get the same exact frame fill as the FX camera would get. The only other way I can understand to do it would be to use a lens with a shorter focal length on the DX camera. But this should change the perspective on the DX image. [/QUOTE]

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