Re: rotational point and focal length

[simon nathan <simonwide@xxxxxxxxxxxxx>]

CHARLES HULCHER IS IN HEAVEN THESE
DAYS AND HE LEFT HIS NODAL POINT NOTEBOOK WITH RICHARD HILL WHO TAKES IT
WITH HIM WHEN HE LEAVES THE BUILDING FOR LUNCH. SINCE YOU KNOW THIS CAMERA
YOU KNOW THAT THEY  ARE BANG ON WITH THEIR LITTLE GEM. THE HULCHER
FOCUSES MORE WITH TRANSPORT ROLLER DIAMETER. I WROTE THIS ONCE BEFORE THAT
"IT WILL BE A COLD DAY IN HELL" WHEN SO-CALLED DEPTH OF FIELD CAN COVER
(OR HIDE) IMAGE SMEAR. SIGNED-SIMON

Andy Buck wrote:

I'm sure this has been discussed ad nauseum, but being
an on again off again subscriber, I'll ask anyway. If
the answer is in the archives, please point me to it.

If rotation on the rear (or some) nodal point is so
important, why is it that cameras such as the Hulcher
(which I've used with very good results), the PanTech,
and others that use 35mm and medium format lenses in
focusing mounts, can get such sharp results merely by
changing the rate of film pull through the camera,
i.e. the rotational point, with relation to the film,
is unchanged?

Thanks!
Andy

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