What causes this?

Maybe, maybe not …

Jump to 33:10 this video by Russ Sadler … He speaks about one of the 4th corner issues…

:smile_cat:

Interesting, but the video would not play for me. With all those rrflections, and me having an 8" reflector telescope, I can see where this can be a factor.

Thanks! You guys make me glad I bought a cheap diode laser!

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