A full shark

[powerlord]

Well, got the second panel last night, but as you can see I'm still getting black bits in the center of the frames. I was thinking it could be dew even though I've got the dew heater on, but I'd expect that to be the opposite..

maybe I had dew when I took the flats ? but it's not obvious in them

hmm.. well that's the best I can do - ok if you can ignore the two circles.

[Craney]

You have got the Shark jumping through hoops  !!

This is such a difficult target.    My attempts look like a sea-slug.   

Yes, dew looks likely with such central circularity.

[simmo39]

Yep thats jaws! I used to have the same problem when I used my ASI 1600mm. I never got to the bottom of the problem as it was intermittent.