[Laser] Results form a crude signal to noise versus frequency check on my optical receiver

[Peter G3PHO]

Zack Widup wrote:

> 
> Anyone have a source for 4" lenses?  I've had a hard time finding 
> something that size.  3" lenses abound but I'd like something bigger at a 
> reasonable cost.


Over here in the UK there are loads of cheap ($3) 100mm (=4") hand 
lenses made in Far Eastern sweat shops! Most of the hardware shops and 
markets have them. They can easily be removed from their plastic frame 
and holder.

Peter, G3PHO