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Thanks Max!
I had a play tonight before the cloud rolled in but I just couldn't get the lens focused and I went from infinity right through to the other end of the scale in small increments. Bad eyesight doesn't help.
I have several Pentax lenses and the PK to Nikon F adapter but not sire if the adapter threw my focus out of whack somehow. I have used the adapter with a late 35mm plastic Pentax lens for the macro capability at 80mm and it was extremely crisp plus a couple of 70s zoon lenses.
I ran through 50 frames , bought the card inside to my computer and realised it couldn't be further out of focus if I tried.
I may have another Pentax 28mm f2.8, not sure what's on the Cosina body, could be 28, 35 or 50, I haven't looked, your image has inspired me to try and I like several of my much older lenses. It's a stunning image!
Throw in sub par live view in the dark for the Nikon D810, I can't even see stars on the screen at f2.8 and 3600 ISO.
If we get another clear night tomorrow I may try again but I'll take my hair dryer out, it was sub zero out there and that may not have helped achieving focus if the lens was frosting up.
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