Laser Beam Concentrator/Aiming Device
Glass Lens/Tin Can Version
The lens is surplus/salvage from a stage lighting device. The effective diameter is about 5" (12.5cm). The body of the concentrator is made of tin cans - coffee, beans and condensed milk.
The cans are held together with epoxy. The reticle is located at the junction of the bean can and the condensed milk can.
With Lens Hood
The lens and hood are held in place with RTV silicone.
View of the Reticle During Installation
The 'legs' were then soldered to the can.
Photosensor Installed in the Reticle
Warning: This device is meant to be used with a visible class-IIIa (<5 mW) laser at a distance.