Quote Originally Posted by mark
It is a go. WooHoo. I have everything I need except the focal length. I want to use 5x7 paper for the negs and I want a fairly wide angle. WOuld seven inches be enough and still have the circle cover the paper or should I go closer to 9 inches for the focal length?

The links would be great. Thanks.
Mark- here are some links, including the Pinhole Calculator, which should help with the design of your camera & class notes.

Information Pages- Very complete sites
Mr. Pinhole
World Wide Pinhole Day- 4/24/2005
Alternative processes site

Camera Info Pages- Instructions & Plans
4x5 foam core camera
Exposure Calculator
Mr. Pinhole's Calculators Page

Supplies- Pinholes, Brass Shim, Etc.
Cameras, books, workshops & more
Pre-drilled pinholes & more
High-quality/expensive pinholes
6”x60” .003mm Brass shim stock part #9504K15

Pre-Built Cameras & Kits

Gorgeous wood cameras
HAL cameras- wow!
More beautiful cameras
Same company that makes 4x5 & 8x10 kits
Santa Barbara Lensless Camera Company
Omniscope, Hexomniscope, Anamorph & Turrets

Handmade Cameras- Great For Ideas
The Great Pintoid Adventure!
Wooden cameras
The classic oatmeal box camera
Teresa Saska's cameras
The Flying Pinhole Camera

Eric Renner "Pinhole Photography: Rediscovering a Historic Technique"
Jim Shull "The beginner's guide to Pinhole Photography" ISBN 0-936262-70-2
William Crawford "The Keepers of the light" ISBN: 87100-158-6

Pinhole Photographers & Images
Fun interface & cool tableaux!
Guy Glorieux "Mémoire floue"
Jeff Dilcher
Pinhole camera made of color photo paper

Camera Obscura
The Giant Camera in SF!
The Sky In Your Room

My site, for more of these links on-line