I want a replacement for my kit lens that came with my 450D (18-55mm IS).
I went out with a Canon 55-250mm F4-5.6 and Canon 50mm F1.8 the other day and found both not suitable for the place I was in (a butterfly house). The focusing distance was the biggest issue. I could not get close enough to the subjects in cramped spaces. I could get a macro lens for sure. But I would prefer something a little more versatile. I note that some zoom lenses allow you to get closer to the subject (some too close apparently) and have macro tagged on to them. I don't really care for the macro moniker on these lenses. I just want something that allows me to get about a foot from the front of the lens (not sensor). Is bright at the widest end (F2.8 would be good). Is within the range of 17-24mm (closer to 17 preferable) to 40+ mm. But above all it must be *SHARP* at most focal lengths. Cromabs and distortion can be fixed to an extent but you can never really fix sharpness.
Cost is also an issue.
I've looked into the Sigma 17-70mm C version lens and it seems a lot of people are saying it's very 'mushy' at the edges and corners especially at the wide end (what about the older version?). I am wondering if there is say a 17/18-50/55mm lens that is a lot sharper or perhaps something else like 24-50mm?
Primes will always beat zooms on this front but if I can find something that meets me halfway with the above criteria I will probably be happy.