[rollei_list] Re: Rolleiflex 35mm Cameras
- From: CarlosMFreaza <cmfreaza@xxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Tue, 10 Nov 2009 12:27:51 -0300
I used that DOF calculator to do a comparison:
24x36mm format 40mmFL f/3.6 10mSubject (f.e.Rollei 35) DOF= 23.9m
5x4' format 400mm f/16 10mSubject DOF= 1.94m
The DOF area difference is very large in favor of the Rollei 35 in
spite of the f/16 for the second sample the lens wide open for the
first sample.
Carlos
2009/11/10, CarlosMFreaza <cmfreaza@xxxxxxxxx>:
> 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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