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Free sample glasses with diffraction grating

AstroLaser

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When members talked about diffraction grating on the forum I remembered that years ago I got some free pairs of 3D glasses from a company that also included some speciality glasses that used diffraction grating, I shined my laser thru the lens recently and it put evenly spaced dots all over the place so I asumed it used diffraction grating on that pair. The glasses are cardboard frame with thin plastic lens, but they work and they were free ! :D

I just checked to see if any places still offered the free glasses, they do, but now they do ask that you send a self-addressed stamped envelope to get your free pair. (which is understandale if they had gotten a lot of requests in the past for free samples and the postage started adding up)

(so technically it is no longer totally free, it now costs sending a self-addressed stamped envelope, but that is understandable)

For your free sample pair they let you choose from several types, I believe the "Fireworks glasses" is probally the diffraction grating type.

(click on the link below to see the types you can choose from as well as the address to send a self-addressed stamped envelope)

Free 3D Glasses - Get a Free pair of 3d glasses from Rainbow Symphony Inc.
 

Petacat

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Thanks Astrolaser! Sent for my free Fireworks shades,
and got the $1.00 Eclipse shades for viewing
the Sun spots as well.:wave:
 
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Thanks Astrolaser! Sent for my free Fireworks shades,
and got the $1.00 Eclipse shades for viewing
the Sun spots as well.:wave:
That's great !

I already had mylar filters specially made for solar observation use so I did not need those eclipse glasses but I might consider getting some anyhow. :cool:

Many years ago I saw an offer online for free sample 3D glasses from one (or more companies, I don't remember right now) and back then they sent me a large (8x11 or so) envelope filled with samples of many various types, different types of 3D, the "fireworks" diffraction grating type and I think some other types. (I guess perhaps they started getting too many requests to be able to continue sending all that and that is probally why they now ask for a SASE to get a free pair of your choice.)
 




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