both lenses are EX f2.8 the 18-50 is one of the digital only lenses. I have a 300D right now and really want a battery grip for it. my current lenses are kit lens, 50mm 1.8, sigma 24-300 (eh...its alright and has mad range yo) I want to know if anyone on here has either of these lenses im on a budget right now but I want a good clear lens and I do a lot of evening photogrpahy so the 2.8 is a big plus for me. I want to spend 500 or so. I also looked at the 17-40 f4L but the f4 is what really kills me about it otherwise it's so beautiful.