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What causes those spikes in star images?
Hello:
I was wondering if it's possible (because I think it is) for a refractor or Schmitt-Cassegrain to exibit those spikes on star images.
Like typically there are 4 at opposite (90 degree) places.
I used to think that those are because of spider vains in the scopes secondary holder.
But now I'm not sure.
Can anyone tell?
Thank you.
David
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