[rollei_list] Re: Rolleiflex 35mm Cameras
- From: Eric Goldstein <egoldste@xxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Tue, 10 Nov 2009 10:18:35 -0500
Read and learn, Carlos:
http://www.normankoren.com/Tutorials/MTF6.html#DOF_focal_length
http://www.luminous-landscape.com/tutorials/dof2.shtml
Eric Goldstein
--
On Tue, Nov 10, 2009 at 9:59 AM, CarlosMFreaza <cmfreaza@xxxxxxxxx> wrote:
> 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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