Quote:
Originally Posted by astro744
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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I was just showing that the basic formula works for all cases starting from zero to four. Not describing any particular type of scope.