This lens is a beauty and has been since long on my wishlist. The initial tests indicate some slight defocus on the left side of the image ( at F2.8). But sharp enough overall and especially in the centre. The intended use of this lens is to exploit it’s fast F/Ratio: fast comet imaging with the Nikon D750 / Large Milky Way or nebula complexes with the Nikon D750 and narrow band imaging with the ASI183mm.
A bit of a re-assurance, these objects now dimmed from 0 to -1 magnitude towards magnitude 4 (estimate). some bits were brighter. Hopelfully that means the impact on the natural sky remains limited. I do fear that all 12000 of these will be a pest for astrophotography, for sure also for professionals!
I actually missed them untill my son detected them as a faint trail east of Bootes (so culmunating).