Archived posting to the Leica Users Group, 2000/11/09

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Subject: Re: [Leica] Re: DOF
From: John Collier <jbcollier@home.com>
Date: Thu, 09 Nov 2000 13:46:36 -0700

Michael.

Please look in your library for books such as Ansel Adams' "The Camera" and
other similar books. You can read it there for yourself.

DOF is determined by just two factors: final image size and relative
aperture used.

Perspective is a function of viewpoint only.

Lens choice does not enter in at all. Take a picture with the subject
filling the frame with your 90 and 35 using the same aperture (you will have
to move closer with the 35). Print to the same size and you will get the
same depth of field. Now take a picture of any scene with your 90 and 35
without changing position. Print the 90 full frame and crop the 35 to match,
identical perspective.

Ansel has his answers illustrated and will be much easier to comprehend than
anything I can cram into my cable line.

John Collier

> From: "M.E.Berube" <MEB@goodphotos.com>
> 
> At 06:25 AM 11/9/00 -0800, you wrote:
>> If you crop a picture shot with a wide angle lens and then enlarge it
>> so it is comparable to a print made through a longer lens, the DOF
>> will be the same in both prints.  The actual lens doesn't affect DOF.
> 
> um...not to be argumentative, but i disagree...
> I am considering DOF to be the point of nearest acceptable focus to the
> point of farthest acceptable focus in any given image.  Like Perspective,
> it is set on the negative as a latent image by your choice of lens and
> aperture. Nothing you do to it during or after development of the negative
> can change the DOF (or perspective such as apparent background
> compression.) You can change Composition and other characteristics (Gamma,
> RGB, hue, contrast, etc..) in the wet or digital lab, but Depth of Field,
> Focus and Perspective are determined in camera.
> 
> Carpe Luminem,
> Michael E. Berube
> 
> 

Replies: Reply from Jim Brick <jim_brick@agilent.com> ([Leica] Re: Re: DOF)
Reply from Jim Brick <jim_brick@agilent.com> ([Leica] Re: Re: DOF)
Reply from "M.E.Berube" <MEB@goodphotos.com> (Re: [Leica] Re: Re: DOF)
Reply from Mark Rabiner <mark@rabiner.cncoffice.com> (Re: [Leica] Re: DOF)