[rollei_list] Re: DOF (was Re: Rolleiflex 35mm Cameras)
- From: CarlosMFreaza <cmfreaza@xxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Fri, 13 Nov 2009 09:59:10 -0300
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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