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[OM] Re: DOF question

Subject: [OM] Re: DOF question
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
Date: Fri, 27 Apr 2007 10:54:24 -0400
All agreed but I think Ali's questions revolved around the quality of 
sensor and lens rather than size of sensor and lens focal length.  At 
least that was my interpretation and the way I tried to answer.

Chuck Norcutt

Piers Hemy wrote:
> And ignoring also the differing degree of enlargement required between the
> different formats to get a uniform size print. 
> 
> --
> Piers 
>             
> 
> -----Original Message-----
> From: olympus-owner@xxxxxxxxxx [mailto:olympus-owner@xxxxxxxxxx] On Behalf
> Of usher99@xxxxxxx
> Sent: 27 April 2007 14:31
> To: olympus@xxxxxxxxxx
> Subject: [OM] Re: DOF question
> 
> 
> Hi,
> To quote one of Winsor's references, in case there is still a question:
>  
> "To maintain the same field of view, the lens focal lengths must be in
> proportion to the format sizes. Assuming, for purposes of comparison, that
> the 4×5 format is four times the size of 35 mm format, if a 4×5 camera used
> a 300 mm lens, a 35 mm camera would need a 75 mm lens for the same field of
> view. For the same f-number, the image made with the 35 mm camera would have
> four times the DOF of the image made with the 4×5 camera."
>  
> Thus ignoring FL and only concentrating on FOV (which is reasonable for
> composing the image) a smaller sensor results in a larger DOF at any given
> aperture. 
>  
> Mike  (still packing)
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