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<blockquote data-quote="Jim_Y" data-source="post: 434029" data-attributes="member: 38138">I fully understand that the DX lens will not utilize the full senor of a full frame camera, but I do have some basic questions about using DX lens.&nbsp; I have several DX lens and even have several old manual lens from my earlier photography days.&nbsp; So, I have been experimenting with some of the DX lens and my biggest question regards a DX lens but with the setting called &quot;Auto DX&quot; set OFF.&nbsp; The photo seems to be full size, not cropped???&nbsp; Why is that?? Also, the manual says that the image might have some darkening around the edges.&nbsp; Why?&nbsp;&nbsp; And a relate question... if I shoot with the &quot;Auto DX&quot; off, and then crop the image later, would I end up with the same exact image that I would have if I had &quot;Auto DX&quot; set to ON?If my old lens are originally made for a 35mm film camera, why would there be any cropping when used in a full-frame camera (D750)?&nbsp; Isn't the sensor exactly the area of 35mm film?&nbsp; I must be missing something....&nbsp; Hope this is clear, but I can elaborate if needed.&nbsp; Thanks.</blockquote>

[QUOTE="Jim_Y, post: 434029, member: 38138"] I fully understand that the DX lens will not utilize the full senor of a full frame camera, but I do have some basic questions about using DX lens. I have several DX lens and even have several old manual lens from my earlier photography days. So, I have been experimenting with some of the DX lens and my biggest question regards a DX lens but with the setting called "Auto DX" set OFF. The photo seems to be full size, not cropped??? Why is that?? Also, the manual says that the image might have some darkening around the edges. Why? And a relate question... if I shoot with the "Auto DX" off, and then crop the image later, would I end up with the same exact image that I would have if I had "Auto DX" set to ON? If my old lens are originally made for a 35mm film camera, why would there be any cropping when used in a full-frame camera (D750)? Isn't the sensor exactly the area of 35mm film? I must be missing something.... Hope this is clear, but I can elaborate if needed. Thanks. [/QUOTE]

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