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Old 04-04-2023, 08:21 PM
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atalas
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Join Date: Mar 2005
Location: Sydney
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Quote:
Originally Posted by Shiraz View Post
maybe check that the spider vanes form straight lines from one side of the ota to the other (check by eye with a ruler for reference). If the secondary is slightly offset from the centre, you may get spiders on each side of the secondary that are not parallel with each other and will give two different diffraction spikes (eg the vertical vanes in the rough illustration attached).

cheers Ray
Yes I believe Ray right won't be such an easy thing to correct If the mounting holes are out of square.
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