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That's with a 200mm lens?
WOW, amazing image sir!
Oh, 28 hours of data, I doubt I'd get close, maybe 2.8 if I was lucky.
I have an old Nikon 80-200 f2.8 ED lens I must chuck on the Astro-trac with my D810 if the cloud and rain ever clears locally one night. It's the older 16 element lens but I have seen mention the more glass elements the more light refracting off the separate pieces of glass and causing ghosting.
It's what I own, bought new in 91 with a tax cheque when I worked so it's a case of it will get a decent image or not and I won't know till I try.
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