Quote Originally Posted by photomc
... but what do you guys use to cut the hole for the lens?
I use Forstner bits to drill the holes, as they create nice clean edges. As I use natural hardwoods, mostly 1/4" thick, for my boards, I mark the center on both sides, and then use a larger bit to countersink the back side for the retainer ring, and then the nearest size bit for the actual hole, drilling from the face side. Once the drilling is done, I then rabbet the outer edge of the board on a shaper to create the edge light seal.

http://www.rbarkerphoto.com/lensboard_hole_sizes.html