Since I was pressed for time, my last post didn't have my usual excessive detail, so here is the source, design, and how to for my Pin Hole Lens:
Go to http://www.edmundoptics.com/ to buy these items:
T-Mount 25/25.4mm Thin Lens Mount
Item Number NT52-292
A Laser Cut Mounted Precision Pinhole
Item Numbers NT56-291 ( 1000 μm ) through NT56-272 ( 1 μm )
I went with the NT56-285 ( 300 μm )
Anti-Reflection (AR) Coated High Efficiency Windows
( To prevent dust from passing through the Pin Hole into the Camera Body )
Item Number NT46-098 ( Window 1" Dia. 3mm Thickness, AR Coating )
and to put all these parts safely together, if you don't already have one, get the Mini Spanner Wrench Set, Item Number NT36-413
The total cost from Edmund is $143.00US. Assembly is straight forward, place the Pin Hole into the Lens Mount, place the Optical window over the Pin Hole, and screw in the retaining ring using the spanner. Just don't over tighten or you'll risk breaking the window. You are done !
If you already have a telescope that you use with your camera, then you'll probably have a T-Mount adapter ring for your camera body mount style. If not, check out Orion T-Rings for 35mm Cameras.
To put your new "lens" to use, attach the T-Mount adapter ring to your SLR, screw on the Pin Hole assembly, place your camera on a tripod and expect Long exposures. Here is a snap that I recently shot:
This image is a crop from a much larger imager frame size, so the soft focus effect is more pronounced