[rollei_list] Re: Rolleiflex 35mm Cameras

I'm afraid you are wrong Eric, DOF is purely a function of aperture
for a given lens (and given frame size), but if the lens focal length
changes the DOF also changes if keeping constant f stop and circle of
confusion size . You could play with this DOF calculator changing only
the lens focal length and you'll see the way the real DOF area also
changes:
http://www.dofmaster.com/dofjs.html
Carlos

2009/11/10, Eric Goldstein <egoldste@xxxxxxxxx>:
> It can be argued that DOF is purely a function of aperture and not FL.
>
>
> Eric Goldstein
>
> --
>
> On Tue, Nov 10, 2009 at 9:32 AM, CarlosMFreaza <cmfreaza@xxxxxxxxx> wrote:
> > Well, "any" camera is a term general too much. DOF has to do first
> > with the lens focal length and the frame size and the circle of
> > confusion size you consider acceptable and second with the f stop; you
> > could stop down a 300mm lens for a 6x9  format at f11 or 16 (to say
> > something) and you could still have more deeper DOF with the Rollei 35
> > at f3.5, my point was that the Rollei 35 Tessar has a reasonable DOF
> > and sharpness even wide open if you focus close to your desired
> > focusing point, in other words, it is not necessary a telemeter under
> > these conditions,  perhaps this was not the topic central axis but it
> > has to do with some messages I read in the thread.
> >
> > BTW, the "universal" camera does not exist yet, if you know your
> > tools, you also know where and why to use them.-
> >
> > Carlos
> >
> >
> > 2009/11/10, Marvin <marvin0@xxxxxxxxxxxxxx>:
> >> I think you missed the point Carlos, it's possible to stop the lens down 
> >> and
> >> have a large depth of field with just about any camera, but that doesn't
> >> afford the individual much control. That's the problem with the 35.
> >> Marvin.
> >>
> >> -----Original Message-----
> >> From: rollei_list-bounce@xxxxxxxxxxxxx
> >> [mailto:rollei_list-bounce@xxxxxxxxxxxxx] On Behalf Of CarlosMFreaza
> >> Sent: 10 November 2009 17:01
> >> To: rollei_list@xxxxxxxxxxxxx
> >> Subject: [rollei_list] Re: Rolleiflex 35mm Cameras
> >>
> >> I rarely had problems guessing the distance with the Rollei 35,  these
> >> two samples were taken during a travel, with the Tessar wide open, 3,5
> >>  1/30 shutter speed and camera hand-held, the film was a Kodak Ultra
> >> 400. The DOF is still deep at f 3.5 and the camera light meter worked
> >> right.
> >>
> >> http://www.flickr.com/photos/itarfoto/1433112977/
> >>
> >> http://www.flickr.com/photos/itarfoto/1456649900/
> >>
> >> Carlos
> >> ---
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