Testing a DX lens on an FX body

Clear skies have been hard to find lately in Ohio - I'd like to blame El Nino. Tonight was one of the first clear nights in several weeks, so I thought I would get out and test my Sigma 10-20mm 1:3.5 DC HSM lens on the Nikon D750. The test shots look pretty positive as long as some serious vignetting doesn't bother you too much. Guess now I need to speak to the new neighbors about turning off their barn lights. 

Night Sky Test #1 Nikon D750 ISO 6400 10mm f/3.5 30 secs.

Night Sky Test #2 Nikon D750 ISO 1000 10mm f/3.5 30 secs.