> 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 > (s...@cts.com)
There's a detailed description of how to do this by Larry Bullis at: http://www.p at ???????/resources/articles/poke.html - Gregg