Have you tried any of the spectacles manufacturers or Contactlens
manufacturers, I work for an optical retailer in the UK, and I see a lot of
3" diameter uncut lenses, perhaps someone could cut you a special near you?

Also, we trash a LOT of badly cut/erroneous lenses, and I'm sure we're not
alone, so talk to the spectacle makers, they may let you grab a bag or go
dumpster shopping?

-Jim




-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of
Michael Wirth
Sent: 24 July 2010 01:09
To: Microcontroller discussion list - Public.
Subject: Re: [EE] Source for cheap plastic lenses?

One standard source for lenses for the DIYer is Edmund Scientific.
Don't know about plastic.  Most of theirs are probably glass.  (Ck.
for their pro optical catalog, as well as their hobbyist/toy website.)

HTH,

Mike

On Fri, Jul 23, 2010 at 11:42 AM, Mike Hord <mike.hord@gmail.com> wrote:
> Anybody know a good source for relatively cheap (say, <$0.50US ea)
> (in qty 100) plastic lenses?
>
> Application is lensing down an IR beam to a moderately small angle.
> If I could get the diameter down to 150mm at 10m, I'd call it a win.
> I'm trying to make a laser tag game, so my receiver needs a wide
> angle of acceptance, but the beam should be small.
>
> The smallest angle I've been able to find has been 5=B0, which puts the
> beam diameter at ~1.7m at 10m.
>
> Google of course returns many results for contact lenses.
>
> Alibaba is an option but parametric search is abysmal.
>
> Buying a large number of cheap toys/flashlights is an option, if I can
> find something that fits the bill.
>
> Yes, I know that the IR won't behave exactly as visible, but it may be
> close enough for this project.
>
> Mike H.
>
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