First time poster here, hello to everyone. Been into photography most of my life on and off. I've certainly got the basics down, not much more beyond that. I was lucky in that my father used to be a professional but most of that was long ago before I was born. I got to play with some old Nikon film SLR's from a young age, so was very helpful. Present day I'm rocking the canon T5i. For someone that has no interest in going pro, this camera is great. I have 5 lenses so far. One of them is the cheap 75-300mm that every idiot has. I notice that the clarity is good for the price, but other than that this thing is a piece of crap. Chromatic aberrations is god awful and it hunts for focus in a bad way. Even outside in daylight it has trouble focusing on the right thing and is very slow to do so. FYI i adjust the auto focus to center point only with this lens. Multi point is just useless with it. So I need a new zoom lens. I'd like to keep the upper end of 300mm. I don't use it constantly, and I'm thinking that a nice canon L series is stupid overkill for a T5. Plus I have no urge to spend $1600 on a used one. The standard F4-5.6 that I have now is just fine, I only really use it outdoors. Is there much out there that will perform better than what I have without costing me a small fortune? I don't mind the off brands, my current favorite lens is a sigma 30mm followed closely by a tokina 11-16mm wide angle. Both were used, still working great. Anything worthwhile? I'd rent but I'd have to drive an hour each way to nearest store that rents gear.... Thanks.