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Old 10-07-2021, 11:35 AM
astro744
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Join Date: Apr 2007
Posts: 1,244
Quote:
Originally Posted by multiweb View Post
"3 spider vanes = 4 spikes (2 overlapping) if 2 are in line and one at 90 degrees, 6 otherwise."
I doubt there are too many reflectors out there with 3 vane spiders that have two vanes inline and one at 90 deg. A significant majority would be 3 vanes at 120 deg. apart producing 6 spikes. What you wrote is correct but perhaps "3 vanes = 6 spikes otherwise 4 spikes if 2 vanes are in line and one vane at 90 deg".

I'm sure the OP appreciated the various replies explaining all the reasons behind diffraction spikes but I got the impression that he was simply asking why 6 spikes on 3 vane spider and 4 spikes on 4 vanes spider.
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