Archived posting to the Leica Users Group, 2005/06/27
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]At 11:26 AM -0700 6/25/05, feli wrote:
>On Jun 25, 2005, at 10:01 AM, Adam Bridge wrote:
>
>>Wait a minute now. For a given lens the DOF is independent of the
>>cropping factor of the sensor, right? So if you use existing M lenses
>>on a digital M with an APS or somesuch chip then the depth of field
>>will be the same for a given f-stop but the crop factor will still be
>>in play.
>
>You are correct. A 50 on a full frame has the same DOF as a 50 on a APS
>(x1.5)
>size sensor. It's the field of view that is cropped. So, with a x1.5
>mag factor your
>50 shows the field of view of a 75, but has the DOF of a 50, which
>is not as shallow
>as a true 75 on a full frame system.
>
>If I wanted the FOV of a 50 on my APS (x1.5) camera I would have use
>a 35 (35x 1.5 = 52.5).
>But I would still have the DOF characteristics of the 35.
>
>Feli
>
>
>
>________________________________________________________
>feli2@earthlink.net 2 + 2 = 4
>www.elanphotos.com
Since the image of the 50 on APS has to be enlarged more, the final
CoC on the print will be larger, so that, conversely, means that the
DOF of a 50 at any given f-stop will be less for a same size print
than the DOF on a full size sensor/film.
--
* Henning J. Wulff
/|\ Wulff Photography & Design
/###\ mailto:henningw@archiphoto.com
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