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Re: [APML] Diffraction spikes with a refractor

Rick Thurmond wrote:
> 
> Here's one for you to explain,
> 
> http://www.saber.net/~thurmond/m45.html
> 
> How did I get a diffraction spike on only one star?  This was taken with
> a C14 and a giant easy guider.

A thin obstruction on the inside of the tube?  Like a metal tab or
something?

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