Help with focusing blue laser/wierd beam shape?

[daguin]

Re: Help with focusing blue laser/wierd beam shape

but now i think you weren't referring to protective glasses.

Correct, I cannot focus on the dot through my prescription glasses but I can without them strangely enough.

Regards rog8811

Many prescription glasses have UV protection on them. The anti-UV coating interferes with 405nm light.

Peace,
dave

 

[rog8811]

Re: Help with focusing blue laser/wierd beam shape

The anti-UV coating interferes with 405nm light.

Thanks for that Dave, I had never considered it may be coatings

Regards rog8811