MT Shooter wrote:
The Sigma 17-50mm F2.8 is a great little lens and should do you well if you are using a crop sensor body. (DC means its for crop sensors in Sigma terms)
The 18-35mm if a beauty of a lens, (also a DC only), and a game changer in many ways, but that gap from 35mm to 70mm might be a bit much for what you are asking about.
Maybe also consider Sigmas newest 17-70mm F2.8-4 lens, I have not used one but its getting wonderful reviews!
I almost mentioned the Sigma 24-105 Art but being a F4 lens, I don't know if it's fast enough for indoor hockey on his camera. It might also not be wide enough. I have never been to a hockey game, so I can't make that recommendation.