Pretty sure that is for telephoto/telescopoic photography. As far as I know pretty much any lens under 200mm will start tracking stars at 30 seconds especially wide angle. If thats what you want then cool, but for milky way shots, generally no bueno.
@Mike have you tried also removing the color noise not just the grain noise? a 50mm 1.4 would be perfect, but you would hve a much narrower POV than using the 10-22. One thing you could do is use the rubber eye piece cover that should have come with your camera and is probaby hanging out on your strap, and cover the eye piece. On long exposures the eye piece lets in light adding grain and light to your photo. Could help if you h avent dont it already. Killer shot anyway man! The lights are high on my photo bucket list
Good point on covering the eye piece, I forgot to mention that. I said it earlier but it should be said again, make sure you remove any filters you have on the lens to prevent light aberrations and flares inside the glass. I have found the 50mm prime to be a great lens for stars, but the best would be a Nikkor nocturne.
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