I had to buy a new lens for night work as my old one has decentered. This is first try with the lens . I think the lens is better suited on my old D600 24M pixels than the D810 35M pixels as the pixels are very close and very small. The D600 I should be able to increase time with far less movement in the stars across the pixels of the camera as they are bigger.....

I would rather get the time above 10 sec than around 8 sec and less stars trailing . This is pure trial work out under the stars while the photo detail is good the stars at the edges are very slightly trailed to get that fixed is drop the exposure time to 5 sec or go to Bigger pixel size so less movement between pixels.