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I've tried using a 1000mm mirror lens for astro work.
The optical characteristics leave so much to be desired that I no longer have any interest in using it.
The stars (even at the centre of the image) come out looking like pregnant 'V's and the vignetting is insane.
Now, to be fair, the lens I'm working with must be at least 30 years old (and I can find zero information about it on the Internet) so its possible that they've evolved significantly over the years...
V.
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