Quote:
Originally Posted by kinetic
Pinched optics?
Main mirror or secondary?
Steve
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Hi Steve
With the x4 PowerMate, when I defocus Sirius just inside and then outside of focus, I see nice concentric rings either side, once the tube currents have died down.
I’ll confess up front that I’m no optics genius,
but I once saw a photo of pinched optics in a book and I think the diffraction patterns were more like rounded triangles?
Cheers
Dennis