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Re: [OM] Depth of field preview

Subject: Re: [OM] Depth of field preview
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
Date: Wed, 24 Jun 2009 16:40:01 -0400
If one were inclined to do such a silly thing.  :-)

In the meantime, when your DOF calculator asks you for the focal ratio 
AND the focal length don't refuse to tell it the focal length on grounds 
that it's immaterial.  :-)

Chuck Norcutt

Jan Steinman wrote:

Well, since we're being pedantic, there are only *two* things that
affect DOF:

1) focal ratio

2) reproduction ratio

<big snip>

> You could construct a mosaic wide-angle with the telephoto  
> from that perspective and have identical DOF.
> 
> Clear as mud yet? :-)

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