RE: where 2 measure needle diameters?

> On Tue, Sep 12, 2000, Kosinski Family wrote:
> > Pinhole wizards,
> > By chance, I photographed a needle and projected it, only to
> > find it had 2 different angles of taper and the diameter was
> > different everywhere along the length of the needle! Checked a
> > lot more needles and found the same thing. The question: where
> > on the needle does the diameter from the much published chart
> > of needle size / diameter apply? If this chart turns out to be
> > mythological, it will only increase my esteem for the inexact
> > art of pinhole photography.
>
> Once you get past the pointy end, beading needles are mostly
> cylindrical. If you can get your hands on one, an easy way to
> measure a needle is with a micrometer. Then, even with a tapered
> needle, you can mark how far to poke it through to achieve the
> desired diameter.
>
> --
> Scott Sellers
> (sds@cts.com)

There's a detailed description of how to do this by Larry Bullis at:

        http://www.pinhole.com/resources/articles/poke.html

- Gregg
Received on Tue Sep 12 12:41:52 2000