See, John agrees. It's just like I said, except I gave the hillbilly version.
:-)
Walt
-------------- Original message from "John A. Lind" : --------------
> At 10:14 AM 7/5/04, Piers Hermy wrote:
>
> >John Lind's mention of Markerink's web site was the opportunity to have
> >another browse - and not just for IR (or UV) photography. It's recommended.
> >In doing so, I found that at
> >http://www.a1.nl/phomepag/markerink/shifcalc.htm Willem has attacked a
> >question which has arisen on the list in the past months, namely "Is the
> >angle of view of the 24mm/35mm shift lens greater than the normal
> >24mm/35mm?".
> [snip]
>
> The 35mm Shift's true focal length is 35mm. Same with the 24mm Shift; it's
> 24mm. The "secret" is in the wider acceptance angle that creates a larger
> image circle. Another way to think about it: a shift lens for 35mm small
> format is actually somewhat like a 35mm focal length designed for a medium
> format SLR with a larger image circle and lens cell farther from the focal
> plane using reverse tele element[s] on the back of the lens cell. The
> mechanical design uses this additional distance in front of the lens mount
> for a shift mechanism that allows moving the larger image circle around the
> smaller film gate.
[snip]
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