I think it would be better if you were to try making a still
camera and then deciding on exposure times using the specific f
stop before trying to animate things.
David Balfour
--- Bernard P Roddy <bproddy@acsu.buffalo.edu> wrote:
> Ed: With humble gratitude to all on the list, I must confess
> I can't
> imagine measuring a pinhole to the thousandths of an inch.
> You are right
> that a Bolex with a pinhole would work wonderfully, too. I
> guess I was
> hoping to bypass the need for a Bolex. I did build the
> camera. It
> actually required that I buy a $1.50 needle and .79 of dowel
> rod, no more.
> I had a shipping box, etc., lying around. Part of the charm
> for me is
> making this film with as few resources as possible (and few
> indeed do I
> have). My only experience with pinhole photography was one
> summer as a
> child, an art class. I still remember setting the box down on
> a rock.
> But to address the practical matters, you may be right about
> the
> difference between pulling film around a dowel that is bare
> and pulling it
> around a dowel with 50 ft of film on it. Perhaps I can just
> do a test of
> the whole 100 ft and make whatever adjustment I discover is
> needed. But
> also, suppose I have determined the f-stop I need. (Stop me
> if I should
> just read a certain book everyone has.) How does this
> translate into
> exposure time? I realize the f-stop is determined by the
> focal length and
> the hole diameter. Suppose it is 2. Does that mean expose
> for 2 seconds?
> My humble thanks.
> Bernie
>
>
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Received on Wed Nov 15 22:44:33 2000
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