[rollei_list] Re: DOF (was Re: Rolleiflex 35mm Cameras)
- From: "Marvin" <marvin0@xxxxxxxxxxxxxx>
- To: <rollei_list@xxxxxxxxxxxxx>
- Date: Sat, 14 Nov 2009 19:05:46 +0800
Carlos do you know why some Rollei 35s have the Carl Zeiss lenses and others
the Schneiders how do thecompare.
Marvin.
-----Original Message-----
From: rollei_list-bounce@xxxxxxxxxxxxx
[mailto:rollei_list-bounce@xxxxxxxxxxxxx] On Behalf Of CarlosMFreaza
Sent: 13 November 2009 22:39
To: rollei_list@xxxxxxxxxxxxx
Subject: [rollei_list] Re: DOF (was Re: Rolleiflex 35mm Cameras)
I'd say that I learnt nothing Eric.
Carlos
2009/11/13, Eric Goldstein <egoldste@xxxxxxxxx>:
> Hi Carlos -
>
> Here is my original statement:
>
> > It can be argued that DOF is purely a function of aperture and not FL.
>
> I'm glad you were able to learn something useful from this discussion.
>
>
> Eric Goldstein
>
> --
>
> On Fri, Nov 13, 2009 at 9:24 AM, CarlosMFreaza <cmfreaza@xxxxxxxxx> wrote:
> > Yes Eric; BTW, I interpret the last part of Richard explanation: "All
> > this given for a constant distance from the subjects" that the
> > difference for the lenses focal length has been cancelled changing the
> > focusing distance to the subject. It's very easy to find the equal DOF
> > for two different lenses changing the lens FL parameter and the
> > Subject focusing distance parameter using a DOF calculator keeping
> > identical the COC, frame size and aperture, this was the confusing
> > part (to me) of your original statement because since I'm changing the
> > focusing distance to equal the DOF for two different FL, I could think
> > that the DOF is a subject focusing distance function.
> > Carlos
> >
> >
> > 2009/11/13, Eric Goldstein <egoldste@xxxxxxxxx>:
> >> Our Richard should be writing and teaching... he has the knack for
clarity.
> >>
> >>
> >> Eric Goldstein
> >>
> >> --
> >>
> >> On Fri, Nov 13, 2009 at 7:59 AM, CarlosMFreaza <cmfreaza@xxxxxxxxx>
wrote:
> >> > Yes, I agree absolutely, if Richard explained DOF that way from the
> >> > beginning, the point would be clear to me from the beginning too,
it's
> >> > a knowledge that you learn using DOF calculators and cameras-lenses
> >> > DOF indicators.-
> >> >
> >> > Carlos
> >> >
> >> > 2009/11/13 Eric Goldstein <egoldste@xxxxxxxxx>:
> >> >> Yes. This was covered in the links I provided, but not expressed so
> >> >> simply and elegantly.
> >> >>
> >> >>
> >> >> Eric Goldstein
> >> >>
> >> >> --
> >> >>
> >> >> On Fri, Nov 13, 2009 at 3:27 AM, Richard Knoppow
<dickburk@xxxxxxxxxxxxx> wrote:
> >> >>>
> >> >>> ----- Original Message ----- From: "Eric Goldstein"
<egoldste@xxxxxxxxx>
> >> >>> To: <rollei_list@xxxxxxxxxxxxx>
> >> >>> Sent: Tuesday, November 10, 2009 7:30 AM
> >> >>> Subject: [rollei_list] Re: Rolleiflex 35mm Cameras
> >> >>>
> >> >>>
> >> >>> It is. Another interesting discussion relative to aperture, DOF and
> >> >>> perceived sharpness:
> >> >>>
> >> >>> http://www.luminous-landscape.com/tutorials/dof2.shtml
> >> >>>
> >> >>>
> >> >>> Eric Goldstein
> >> >>>
> >> >>> Depth of field/depth of focus can be defined as either the
amount of
> >> >>> defocusing that produces a constant size circle of confusion or for
a circle
> >> >>> of confusion which is a constant percentage of focal length. When
the first
> >> >>> definition is used the depth depends only on the physical size of
the
> >> >>> aperture. Thus it will be the same for a 100mm lens at f/2.8 as for
a 200mm
> >> >>> lens at f/5.6. Where the image from the shorter lens is magnified
to equal
> >> >>> the image from the larger lens the DOF will be constant with
f/stop. All
> >> >>> this given for a constant distance from the subjects.
> >> >>>
> >> >>> --
> >> >>> Richard Knoppow
> >> >>> Los Angeles, CA, USA
> >> >>> dickburk@xxxxxxxxxxxxx
> >> >>> ---
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