[Laser] Cheap 8x11 Lens

[Zack Widup]

I taped one of these Fresnel lenses to a sheet of glass (at the corners) 
for extra rigidity.  You could probably also use an acrylic sheet, which
would be less fragile if you're bouncing it around in a car like I do.  :)

Zack W9SZ  

On Mon, 4 Feb 2002, Bob Williams wrote:

> On Sunday 03 February 2002 16:50, Paul Kelley wrote:
> > Can you tell us how rigid it is? Does it hold its shape well enough to
> > still focus properly when mounted by the edges and perhaps tilted at an
> > angle?
> >
> Paul,
> 
> Yes, it appears to be plenty rigid when mounted by the apx. 0.25" lip and 
> pointed straight up, I don't get any obvious deflection.  It's fairly thick 
> plastic.  I imagine that in a good wind, it might, indeed, flex a bit, 
> though. The packing, an envelope, will allow you to judge that for yourself, 
> if you find one at an office supply store.
>