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)
> ________________________________________________________________________
> AOL now offers free email to everyone. Find out more about what's free from
> AOL at AOL.com.
>
> ==============================================
> List usage info: http://www.zuikoholic.com
> List nannies: olympusadmin@xxxxxxxxxx
> ==============================================
>
> ==============================================
> List usage info: http://www.zuikoholic.com
> List nannies: olympusadmin@xxxxxxxxxx
> ==============================================
>
>
>
==============================================
List usage info: http://www.zuikoholic.com
List nannies: olympusadmin@xxxxxxxxxx
==============================================
|