Hello! I have a Canon 60D with an 18-135 IS mounted on it that has been fine for many of my needs. I got a fisheye for some fun wide angles (Rokinon 8 mm, aka "you're not getting out of this picture, it doesn't matter where you try to go") last August and a 50 mm 1.8 for Christmas from my brother (also a photographer and lurking around here somewhere).
The three lenses do a nice job covering a good portion of what I enjoy shooting, but I want something with more reach. The 135 mm, even on a crop body, isn't quite cutting it for me. I'm wanting to get something that will put my maximum closer to 200 mm or more. I've been looking at used Sigma 18-250 mm lenses and wanted to get thoughts on that option, since it's not an overly expensive lens.
The snafu in all of this is that the very, very large majority of my money for a new lens will have to come from selling my 18-135. I got it serviced and cleaned last year at a reputable place in NYC, so it is functioning extremely well right now. I keep it in the best condition I can and the only issue with it is a tiny scratch on the front element that, from what I can tell, doesn't affect image quality at all. This gives me hope that I can get a decent price for the lens and put that plus a bit of my own, if necessary, toward whatever I choose.
So what are people's thoughts on the Sigma? Any other lenses comparable in price that people prefer? I have medical bills from a surgery to pay and a very low-paying job, plus a cruise in a few months that I need to have some cash for and a graduate degree to start, so "save and get this awesome $600+ lens" is not something that's feasible right now or in the foreseeable future. I'd really like to not be constrained to shooting out near the 135 mm end and then cropping out excess background on subjects I couldn't get any closer to, which is what I've been doing.
And yes, I tried to do a search, but the search on this apparently new-ish board doesn't really make sense to me right now. If you have any questions about something I wasn't clear about or didn't think of, just ask. 




