[Leica] Question: Depth of field for a Noct. on a digital M

[henningw at archiphoto.com (Henning Wulff)]

At 5:04 PM -0800 3/25/06, Adam Bridge wrote:
>Assuming for a moment that the crop factor for the digital M is
>identical to that of the DMR...
>
>if you mount a Noctilux on the Digital M - shoot a scene - then shoot
>the same scene with the same lens mounted on an M6 - print both
>images, the M6 cropped to the same content as the Digital M, will the
>depth of field be identical?
>
>If not, why not?
>
>Thank you.
>
>adam

Absolutely.

Depth of field depends on aperture, focal length, subject distance, 
print/crop size and acceptable fuzziness (circle of confusion). There 
is a relationship between all of these, but if all of the parameters 
remain the same the depth of field will be the same. The sensor/film 
characteristics don't enter into it unless it's capabilities are far 
below what the lens can deliver. Film and digital sensors are well 
beyond that now.

The crop factor as announced is essentially the same as for the DMR; 
the sensors are not the same, but of essentially the same sizes and 
resolution.

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    *            Henning J. Wulff
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