Re: 220 headaches

----- Original Message -----
From: "Murray Leshner" <murrayatuptowngallery@yahoo.com>

>...this is still entrenched in length per turn and
> not turn per length,

Murray,

If you have "length per turn", just divide 1 by "length per turn" and you
will have "turns per unit of length". For instance, if 1 turn give you
0.5", dividing 1 by 0.5 will result in 2, meaning you need to turn 2 times
to advance a length of 1". Another way of seeing it would be: if 1 turn
give you 1/4 the length of a frame+whatever gap you need in between frames,
dividing 1 by 1/4 would result in 4, meaning you need to turn the advance
knob 4 times to advance to the next frame.

But math is really not the way to go this time, progressively each turn of
the knob advances more film than the previous one, this could be accounted
for in a calculation, but unfortunately if the film is not really tightly
wound around the take up spool, your math calculation will be off the mark.
I would make a mark on the advance knob and another on the camera
symbolizing "home position" from which to start advancing each roll, then
I'd mount a roll, and with the back open start advancing it frame by frame
(making marks on the film) and I would also add a wider gap between frames
(for safety). After each frame+gap is advanced, I would then make a mark on
the camera just in front of the mark on the knob and label it "1" (as in
frame 1), keep doing it until the end of the roll.

Guillermo
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Received on Sat Aug 6 05:44:18 2005