Thanks for taking the time to read this.
So both have a constant max aperture of 2.8. A big subject for me is shooting concerts. I am on a 450d so the 17-50 becomes a 27.2-80 and the 28-75 a 44.8-120.
At concerts I have been exclusively using the 50 1.8. Roughly 80% of the time, when I wish that I had a zoom lens, I wish I could go wider, often times a lot wider. But there are those occasionally instances where I want I longer focal length.
At this point the 28-75 seems like the better choice. Is either lens more prone to flare? Is one generally sharper, especially when wide open? Any insight would be really helpful.