----- Original Message ----- From: "Richard Heather" <rheat...@slonet.org>
> See the pinhole size calculator at Pinhole Visions: (Larry Bullis) > http://www.???????/resources/articles/makingholes.php > Guillermo's page: > http://members.home.net/penate/pinsize.htm > There are various calculations that are based on the assumption that you > will shoot at infinity. For close up views a smaller hole will give > sharper results. For close up work just multiply your optimum pinhole size, obtained with any of the formulas available out there, by the "correction factor": Correction factor = SQRT ( O / I + O ) where O = distance pinhole lens to object being photographed and I = distance pinhole lens to film SQRT stands for square root of Guillermo
