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Widefield narrowband M42+Horsehead
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08-11-2019, 07:47 PM
gregbradley
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Join Date: Feb 2006
Location: Sydney
Posts: 18,183
I have that lens also but haven’t tried it for astro.
As you first said the adapter may be flexing
Or spacing is a bit off.
I have found adapters can vary in length although that affected ultra
Wide angle lenses more.
Greg
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