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Looking for a lens to produce a circle pattern with a dot in the middle

adto

New member
Joined
Oct 22, 2021
Messages
1
Points
1
Hi,
I'm looking for a lens that can produce a pattern of a circle with a dot in the middle (like this ⊙ ), which at a distance of 80cm will make the circle have a radius of 1.5cm. Possibly one that doesn't cost much and could be available in bulk. I have found some full laser assemblies that can do that but they cost way too much (hundreds of dollars, where i'm looking for abt 10).
I know this is very specific, but does anybody know where I can look?

Thanks in advance
 



bostjan

Active member
Joined
Dec 29, 2011
Messages
159
Points
28
How perfect of a circle do you need? There are cat toys that come with star caps that do exactly that, but the circle is usually just a ring of small dots. You could adjust the size with a focusing lens.
 




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