Re: fixed focus panoramic

[simon nathan <simonwide@xxxxxxxxxxxxx>]

dear andy- i will give my experience
if you will listen a bit. it is from my 1970's early hulcherama experience,
ok? the first lens for the models that were for sale was selected by simon
for his own use as well as to increase salability. this was 35mm fl from
mamiya which covered 6x4.5", therefore and easily the vertical slit. lens
were set at hyperfocal distance and the focusing mount didn't do diddly
except turn, rotate. hulcher was smart as a whip and he created two additional
focusing (my malaprop) transport rollers. #1 was supplied with the camera.
#2,#3 costa ya extra. picture this. hulcher ain't doing anything cirkuit
guys don't know about. they shift or change gears. varoooommmmmmm.these
different diameter rollers move different amounts of film. in effect you
are changing the image circle and the focus happens because you are advancing
a matching amount of film to points you want sharp. i have rollers for
even closer focus. #4.#5 and i have used them well. i recall an ann report
that asked for interior of upstairs-boeing 747 cockpit. off line i shall
tell why we chose 35mm mamiya lens even though two prototypes had 50mm
lenses. simon nathan   andy, it will be a cold day in hell when
you can overcome image smear with depth of field!

Andy Buck wrote:

A little help, please! This is probably a basic
question, but I'm an on again/off again subscriber.

I am building a 360 that will use a 90mm f/8 super
angulon. The actual focal length has been measured at
89.23mm, i.e. focused at infinity. It will be built
with fixed focus - for simplicity. Focusing at 15' and
closing down to f/16 gives me the depth of field I
need.

Given a focal length of 89.23mm, that distance is
increased by 1.77mm to focus at 15'. My questions:

1. Obviously, that 1.77mm should be added to the
flange-to-film distance. Should it be added to the
pivot radius, as well?

2. Should the 1.77mm be added into the film length,
i.e. rate of film movement?

After writing this, it seems like the answer to both
will be the same.

Thanks!!!!

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