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That's a heavily loaded SA, Kelvin, and the Sigma lens looks suitably impressive.
I have one of the Geoptik adapters for Nikon but, unfortunately, it was about 1mm too thick to work with the ASI1600mm and EFW. Starizona have an adapter that looks to be good quality but it is expensive and also doesn't have enough back focus for the mono camera and filter wheel. Let me know what you think of the Geoptik look alike when it arrives.
Cheers,
Rick.
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