Reply to thread

Message

<blockquote data-quote="WayneF" data-source="post: 174184" data-attributes="member: 12496">The lens is always the marked focal length.&nbsp; The lens does not change regardless what FX or DX camera body you put it on.All that does change is the DX sensor is smaller, therefore it only sees a smaller central part of the area that the lens does project.&nbsp; &nbsp; IOW, the DX image is simply cropped smaller.&nbsp; This smaller sensor does not see a view as wide as if it were not cropped.&nbsp; So the angle of view does change (smaller), and so it then looks as if we stood in the same place, but used a lens focal length 1.5x longer on FX (which would also crop so to speak, zoomed in longer to a smaller view).&nbsp; &nbsp; This 1.5x DX Equivalent Focal Length is just the number of what the smaller view &quot;looks like&quot;, if it were compared to FX.But the lens is definitely still as marked, which never changes.&nbsp; The same lens always does the same thing, regardless.&nbsp; &nbsp; All that changed was the cropped smaller view, and the resulting smaller angle of view on the smaller DX sensor.See <a href="http://www.scantips.com/lights/cropfactor.html" target="_blank">FX - DX Lens Crop Factor</a>&nbsp;&nbsp; for more</blockquote>

[QUOTE="WayneF, post: 174184, member: 12496"] The lens is always the marked focal length. The lens does not change regardless what FX or DX camera body you put it on. All that does change is the DX sensor is smaller, therefore it only sees a smaller central part of the area that the lens does project. IOW, the DX image is simply cropped smaller. This smaller sensor does not see a view as wide as if it were not cropped. So the angle of view does change (smaller), and so it then looks as if we stood in the same place, but used a lens focal length 1.5x longer on FX (which would also crop so to speak, zoomed in longer to a smaller view). This 1.5x DX Equivalent Focal Length is just the number of what the smaller view "looks like", if it were compared to FX. But the lens is definitely still as marked, which never changes. The same lens always does the same thing, regardless. All that changed was the cropped smaller view, and the resulting smaller angle of view on the smaller DX sensor. See [URL="http://www.scantips.com/lights/cropfactor.html"]FX - DX Lens Crop Factor[/URL] for more [/QUOTE]

Verification