fingerz
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DJW's thread about lenses for different budgets was the inspiration for this, really. So cheers DJW 
However, instead of listing nine lenses, I only want to know one - your main walkabout lens, since this is the main lens beginners/people will want to spend money on. Plus I want a slightly more detailed description of why you went for it and whether you'd do the same again if you had to buy a new all-purpose lens tomorrow. If you have more than one walkabout lens then pick your favourite (the one you couldn't live without).
I'll start. Mine is the Sigma 18-50mm F2.8 EX DC. I chose it because I wanted a replacement for the Canon kit lens on a budget. My main concerns were that I wanted something fast (f/2.8 throughout) and it had to go down into the teens at the wide end. Apart from that the only considerations were optical quality and price.
Overall I'm quite happy with it but I do tend to find that it doesn't auto-focus as well as I'd like at 18mm. I usually find myself focusing at 50mm (where the AF seems fine) and then pulling back to 18mm while keeping the focus locked. Apart from that the only bad thing I can say is that it's not as sharp as the 17-40L, but that's to be expected for the price.
If I was buying again, I might spend a bit more time considering whether I'd be prepared to sacrifice the wide maximum aperture for the proven optical quality and better AF of the 17-40L, albeit at a higher price. The 16-35 F2.8L is far too expensive for the extra speed so I'd either have to make do with a slower lens or go into the 24-70mm range, where there are quite a few more choices but the range isn't as useful on 1.6x crop cameras.
So that's mine. Over to you.
Edit: just to add, my ideal (but reasonably realistic) walkabout lens would be 18-80mm, f/2.8 throughout the zoom, have image stabilisation and all the usual nice stuff (good optical quality from about f/4 upwards, USM with FTM focus, decent build quality, non-moving front end, etc)
However, instead of listing nine lenses, I only want to know one - your main walkabout lens, since this is the main lens beginners/people will want to spend money on. Plus I want a slightly more detailed description of why you went for it and whether you'd do the same again if you had to buy a new all-purpose lens tomorrow. If you have more than one walkabout lens then pick your favourite (the one you couldn't live without).
I'll start. Mine is the Sigma 18-50mm F2.8 EX DC. I chose it because I wanted a replacement for the Canon kit lens on a budget. My main concerns were that I wanted something fast (f/2.8 throughout) and it had to go down into the teens at the wide end. Apart from that the only considerations were optical quality and price.
Overall I'm quite happy with it but I do tend to find that it doesn't auto-focus as well as I'd like at 18mm. I usually find myself focusing at 50mm (where the AF seems fine) and then pulling back to 18mm while keeping the focus locked. Apart from that the only bad thing I can say is that it's not as sharp as the 17-40L, but that's to be expected for the price.
If I was buying again, I might spend a bit more time considering whether I'd be prepared to sacrifice the wide maximum aperture for the proven optical quality and better AF of the 17-40L, albeit at a higher price. The 16-35 F2.8L is far too expensive for the extra speed so I'd either have to make do with a slower lens or go into the 24-70mm range, where there are quite a few more choices but the range isn't as useful on 1.6x crop cameras.
So that's mine. Over to you.
Edit: just to add, my ideal (but reasonably realistic) walkabout lens would be 18-80mm, f/2.8 throughout the zoom, have image stabilisation and all the usual nice stuff (good optical quality from about f/4 upwards, USM with FTM focus, decent build quality, non-moving front end, etc)