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Nikon D750
28-300 mm Nikkor Lens
300 mm 10 Sec f/5.6
ISO 4032
None
As for the colors of Stars:
This is Sirius
These were created by swirling the camera around and an exposure time of 20 seconds.
This is the opposite of light painting where the camera is static and the light is moved around creating designs.
You can clearly see reds, yellows, greens, blues, violets. No color added, just straight from the camera