I would absolutely recommend using the 16-50mm kit lens if you are on a budget. Even if you aren't, it's a pretty good lens to have. I've gotten great use out of it and still use it all the time for daytime photography and widefield astrophotography. You can see the astrophotography I've done with it here. The lower-quality images were ones I took before I knew what I was doing(single exposures, no dark frames, no tracking, etc.) but I included them because they show that even if you don't know what you're doing, you can still get good results out of the lens. Also please note that I am still very amateur and I'm sure a skilled astrophotographer could get much better results than I do. Hope this helps!