[rollei_list] DOF (was Re: Rolleiflex 35mm Cameras)
- From: Eric Goldstein <egoldste@xxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Fri, 13 Nov 2009 07:49:43 -0500
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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