The answer is NO.
Photo 1: 180mm lens, 6x9 film.
Photo 2: 50mm lens 35mm film
Photo 3: 25mm lens 4/3 sensor
All three will have about the same FOV from the same camera position.
All three will show the same perspective compression.
At the same apertures, the shorter lenses will show much more depth of field.
Skip
----- Original Message ---------------
Subject: [OM] Re: Great E-1 150/2.0 pix on dpreview.com
From: "Piers Hemy" <piers@xxxxxxxx>
Date: Thu, 2 Dec 2004 17:34:21 -0000
To: <olympus@xxxxxxxxxx>
>
>Yes, I see that clearly.
>
>But typically we look at 10x8 prints. So produce a 10x8 from each. Would
>they each appear to be as 'in focus' as each other?
>
>I would try it myself, but the batteries on my Graflex are flat. Or
>something.
>
>--
>Piers
>
>-----Original Message-----
>From: olympus-owner@xxxxxxxxxx [mailto:olympus-owner@xxxxxxxxxx] On Behalf
>Of Walt Wayman
>Sent: 02 December 2004 16:33
>To: olympus@xxxxxxxxxx
>Subject: [OM] Re: Great E-1 150/2.0 pix on dpreview.com
>
>Exactly. Skip explains it quite correctly, but allow me an example:
>
>I have a 180mm Rodenstock lens I use fairly often with my 6x9cm Graflex
>XLRF. If I were to take a photograph of an object from a fixed point with
>it on the Graflex and the 180/2.8 Zuiko on an OM, assuming the same aperture
>is set on each lens, if I cropped a 24x36mm section from the center of the
>6x9cm negative, it and the 35mm frame shot with the Zuiko would be, for all
>intents and purposes, identical.
>
>Walt
>
>--
>"Anything more than 500 yards from
>the car just isn't photogenic." --
>Edward Weston
>
> -------------- Original message ----------------------
>From: Skip Williams <om2@xxxxxxxxxxxxxxxx>
>>
>> > On a film camera, for a given focal length, as the format gets
>> > smaller, so the
>> DoF gets narrower.
>>
>> (I'm no optical engineer, just a hack.)
>>
>> Calculation of DOF is independent of the film/sensor size. This
>> assumes that DOF is really a measure of apparant sharpness based on
>> some minimum circle-of-confusion.
>>
>> A 300mm lens that has an image circle large enough to cover a 5x7
>> piece of film produces the exact same image size as a 300mm lens on a
>> 4/3 camera. The 4/3 camera only uses a small crop of the 5x7 lens'
>> image. The DOF characteristics are the same. That's why you
>> typically see LF photographers using f/45-128 to get enough depth of
>> field to cover reasonable subjects. You could stop a 4/3 300mm lens
>> down to f/22 or so, but the long exposure times wouldn't make is usable,
>whereas the LF lens is used for fixed subjects.
>>
>> Your statement above should really say: As image magnification
>> on-the-film/sensor stays constant, the DOF increases as the
>> film/sensor format gets smaller.
>>
>> Skip
>>
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