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<blockquote data-quote="WayneF" data-source="post: 359226" data-attributes="member: 12496">The lens does not change in any way on DX - it is still 70-200 and f/2.8.&nbsp; &nbsp; DX does not affect aperture, or the lens at all.&nbsp; &nbsp; All that changes is that the smaller DX sensor crops the view from the lens, to be seen as a smaller view (cropped - less width).&nbsp; So then the numerical idea is that DX view LOOKS LIKE the field of view that 105-300 would see if ON A FX CAMERA (standing at same spot).&nbsp;&nbsp; As compared to FX, it just LOOKS LIKE the lens was 1.5x longer than it is. But it wasn't, the DX VIEW was just cropped smaller.&nbsp; It is still 70-200 f/2.8.The lens is what it is, unchanged.&nbsp; The DX crop factor is just a way to compare its DX VIEW to the FX VIEW, due to the smaller DX cropped sensor size.&nbsp; &nbsp;&nbsp; The DX view is from the same lens, just cropped smaller, and then seen enlarged back more.Cropping ANY IMAGE later in the photo editor, reduces its area size, and then when we enlarge it back, it SIMULATES the same telephoto zoom effect we attribute to DX.&nbsp; The only difference is the DX image retains all of its sensor pixels, none are missing.See <a href="http://www.scantips.com/lights/cropfactor.html" target="_blank">FX - DX Lens Crop Factor</a></blockquote>

[QUOTE="WayneF, post: 359226, member: 12496"] The lens does not change in any way on DX - it is still 70-200 and f/2.8. DX does not affect aperture, or the lens at all. All that changes is that the smaller DX sensor crops the view from the lens, to be seen as a smaller view (cropped - less width). So then the numerical idea is that DX view LOOKS LIKE the field of view that 105-300 would see if ON A FX CAMERA (standing at same spot). As compared to FX, it just LOOKS LIKE the lens was 1.5x longer than it is. But it wasn't, the DX VIEW was just cropped smaller. It is still 70-200 f/2.8. The lens is what it is, unchanged. The DX crop factor is just a way to compare its DX VIEW to the FX VIEW, due to the smaller DX cropped sensor size. The DX view is from the same lens, just cropped smaller, and then seen enlarged back more. Cropping ANY IMAGE later in the photo editor, reduces its area size, and then when we enlarge it back, it SIMULATES the same telephoto zoom effect we attribute to DX. The only difference is the DX image retains all of its sensor pixels, none are missing. See [URL="http://www.scantips.com/lights/cropfactor.html"]FX - DX Lens Crop Factor[/URL] [/QUOTE]

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