I love the 17-55, but for the situation you're describing, I think it'll be a little too dark. Even spending $90 on the 50 1.8 would be worth it. I shoot a lot of low light shots, and there's a big difference between my 50 1.8 and my 17-55 2.8.


Then again, if it's a museum, the exhibits will be pretty well-lit, right? If you're just shooting exhibits and not people, i think the 17-55 would be OK.