My approach is to use a 50mm (2") lens. An old 10x50 binocular will do just fine. I am pointing the laser through a 9mm Plano lens to focus the beam onto the 50mm lens. This should give me a real nice beam at some distance. 73, Steve -----Original Message----- From: K. Rudolph, KD7JYK Suppliers of lenses ranging in sizes from 3/4" to 4". Kurt