2009/6/29 C.H.Ling
> ----- 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 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
> > 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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