Originally Posted by xenophobe
Umm... everyone here is worried about dust on the sensor. That's a non-issue. It can be relatively easily cleaned.
And $250 is a pretty decent deal for all of that. Try the Sigma before selling it, you might actually like it. It's a decent focal range and isn't a bad beginner's lens... distortion will be considerable, but it can mostly be corrected by any number of programs.
If you find you really enjoy DSLR photography, I'd suggest selling all of it and moving to Canon. Nice lenses are a bit cheaper and the system is a bit more user friendly.
I doubt your average new photographer feels okay sticking a sensor wand in there. I'm pretty sure most people on this forum do cleaning themselves (myself included), but it's not to say that everyone feels comfortable doing so. Besides, even with a $100 lens I expect the equipment to be clean, let alone something worth $250.
And while I agree with the focal length, the distortion is the problem I have with the lens. Again, the OP is a beginner and I doubt he'd have a good software suite to fix distortion. Even then it'd have to be manually done since I doubt even LR would have lens data on that particular lens.
And finally, I disagree with the user friendly statement for Canon. It's a personal taste thing, honestly. Canon users find Canon cameras more comfortable, and Nikon users find Nikon cameras more comfortable. One isn't more user friendly than the other. Besides, I'd argue that the Guide Mode on the D3000 is more beginner-friendly than the Creative Auto mode on Canon (no damn clue why they even stuck that on my 50D, but that's a different story).