----- Original Message -----
From: "Tom Fenwick"
> On 29 Jun 2009, at 05:26, Ken Norton wrote:
>>>
>>
>> Yes, if you crop the image from the 25mm lens to the exact same
>> framing as
>> the 300mm image and then print or display them at the same size.
>
> This is absolutely correct. Optically you are choosing to do the
> enlarging in camera with the 300 and later with the 25. The result is
> the same.
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 can imagine various factors that could make the result look
> different; the relative properties of the two lenses, enlarger,
> scanner, upsizing software, depending on how you conducted the
> experiment...
Is there any test sample that shown they have the same DOF? My
result shown they are VERY different.
C.H.Ling
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