Helios
0
- Joined
- Jan 7, 2011
- Messages
- 1,341
- Points
- 48
Looks definitive to me. Damn
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Actual dot pictures would be helpful. You can use a polarized lens like those you get at a 3d movie to dim the beams some, it may make it easier to tell them apart if they are all the same brightness.
You would be able to tell the difference though, 635 to 660 is a big leap.
I don't think that's necessary. I know a 632.8nm HeNe looks drastically different than 660... If these were anywhere below 645, it'd be distinctly noticeable, especially side by side with a 660.
Which seller is this?