On 30 Jun 2009, at 02:55, "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?
:-) I dont think that counts... The film plane to lens flange distance
is different, but both lenses record the same perspective on the same
size medium... I can't remember the optical terms, but I think there
is an effective optical centre for the lens which matches the focal
length independant of the actual size, shape and degree of retrofocus
chosen or demanded by the design...
Tom
> C.H.Ling
>
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