For the same magnification, a 100mm equivalent lens should gives the same
"working distance" as a 100mm lens in 35mm system (except for close up may
be), it means the distance to the subject will be the same.
C.H.Ling
----- Original Message -----
From: "Chuck Norcutt"
>A little bit. The DoF formula wants the distance to the subject. But
> subject distance is measured from the image plane. If you move that
> forward by a few millimeters you'll get a different DoF. :-) :-)
>
> Chuck Norcutt
>
> C.H.Ling wrote:
>> ----- Original Message -----
>> From: "Tom Fenwick"
>>
>>> 2009/6/29 C.H.Ling
>>>> I'd love that's true then I don't need to worry the DOF of my FZ-18's
>>>> 1/2.5"
>>>> sensor and the 500mm equivalent lens as the DOF should be the same as
>>>> my
>>>> 5D
>>>> II with a true 500mm lens.
>>>>
>>> I wish I could explain the whole discussion, but this bit above is
>>> easy -
>>> you've mucked things up on the FZ-18 by moving the sensor/film plane
>>> towards
>>> the lens!
>>>
>>> Tom
>>>
>>
>> Really? The film plane to lens distance will affect the DOF? What about
>> the
>> DOF of Leica RF 35mm to OM 35mm system?
>>
>> C.H.Ling
>>
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