[Leica] M8 & Depth of Field

[jbcollier at shaw.ca (John Collier)]

If you print the results to the same magnification (% of life size),  
then you are right. However if the print size is constant then  
magnification (% lifesize) will vary and, as a result, so will depth  
of field.

John Collier

On 1-Nov-06, at 10:23 AM, Philip Forrest wrote:

> The angle of view is different, but everything else about the image is
> exactly the same.  If you use a 47mm large format lens on a 35mm or  
> a 6x6 or
> a 4x5 the results will be exactly the same on the film plane.  The big
> difference between a 6x6 50mm lens and the same focal length for a  
> 35mm
> camera is lens coverage.  All that said, the lens will always have  
> the same
> depth of field regardless of format.  Leica lenses don't know  
> whether they
> are on Leicas or Epsons or Deardorffs or oatmeal boxes.  The lens  
> doesn't
> know & doesn't care.  It does one thing, project an image onto a  
> plane.  The
> best way to discern this difference is to shoot the same focal  
> length lens
> with several different formats, then look at the negatives, not
> enlargements.  OR make prints that keep the difference of format  
> apparent.
> Ie: shoot one scene with three different cameras all with 75mm  
> lenses then
> make prints at a 3x enlargement for all of them.  Then cut out the  
> center of
> the largest prints to match the size of the smallest ones.  They  
> will be
> exactly the same