Reply to thread

Message

<blockquote data-quote="BackdoorArts" data-source="post: 203621" data-attributes="member: 9240">It has no more &quot;zoom&quot; on a DX than it does on an FX.&nbsp; A 50mm is a 50mm regardless of crop factor.&nbsp; The only difference is the field of view projected by the lens that is captured by the sensor. &quot;Zoom&quot;, or the changing of focal length, alters everything from depth of field to the perceived spatial orientation of the objects in the photo (zoom in and objects appear closer together, zoom out they separate).&nbsp; Yes, the same fixed length lens used on an FX and DX will produce photos that appear different, but the DX photo will be contained completely within the FX photo, all other things being equal, exactly as it appears straight from the DX body.&nbsp; What you are talking about is effective focal length, which can be calculated by multiplying the lens focal length by 1.5 when using it on a DX.&nbsp; So, yes, a 50mm on a DX will have an effective focal length of 75mm (i.e. the view left to right and top to bottom will be equivalent - not identical!!), but it will have none of the optical characteristics of a 75mm when used on an FX body.&nbsp; It still looks like a 50mm only cropped.This is not a difficult concept, but people just can't seem to wrap their heads around it.</blockquote>

[QUOTE="BackdoorArts, post: 203621, member: 9240"] It has no more "zoom" on a DX than it does on an FX. A 50mm is a 50mm regardless of crop factor. The only difference is the field of view projected by the lens that is captured by the sensor. "Zoom", or the changing of focal length, alters everything from depth of field to the perceived spatial orientation of the objects in the photo (zoom in and objects appear closer together, zoom out they separate). Yes, the same fixed length lens used on an FX and DX will produce photos that appear different, but the DX photo will be contained completely within the FX photo, all other things being equal, [B][I]exactly[/I][/B] as it appears straight from the DX body. What you are talking about is [I]effective focal length[/I], which can be calculated by multiplying the lens focal length by 1.5 when using it on a DX. So, yes, a 50mm on a DX will have an [I]effective focal length[/I] of 75mm (i.e. the view left to right and top to bottom will be [I]equivalent - not identical!![/I]), but it will have [I][B]none[/B][/I] of the optical characteristics of a 75mm when used on an FX body. It still looks like a 50mm only cropped. This is not a difficult concept, but people just can't seem to wrap their heads around it. [/QUOTE]

Verification