Hi David
From one newbie to another, I thought I'd add my two cents worth, as I'm about six months ahead of you...
I purchased a 450D when they first came out in April, along with a Sigma 18-200 IS lens. I figured on buying that lens alone, because I thought it would do everything I wanted in photography, and I wouldn't have to lug around extra lenses, and keep changing them all the time. All of this sounded like too much hassle, plus the issues of dust in sensors etc. I'm also planning on going OS again soon too, so this was (and still is) a consideration for me too.
As it turns out (with all of my vast experience...
) it has become the lens I use the very least. I actually took it around to the distributors and had them check it out, because it's really not a particularly sharp lens. While I was initially impressed with it's focal range, I was disappointed with how few pics were
truly sharp. (They said it was within spec... hmmm)
I know my skills with my 450D have improved since, or perhaps I should say I have learnt how to use it more accurately and consistently (always using spot focus works for me, for one thing). Perhaps I should put the 18-200 back on and see if it was just me!
Have a look around the forum. There will be plenty of times your jaw will drop when you come across someone's fantastic picture. Almost always, these pics will have been taken with a lens that goes down to f2.8. Unfortunately, this generally means extra $$$ and extra size/weight, but the difference in output quality is immediate.
If you'll indulge me, a quick review of my glass:
The 18-200 IS: as mentioned above. Must have more faith in it. The Image Stabilisation (in any lens) is amazing technology. My workmate has the Nikon equivalent on his D80 as his
only lens and loves it.
24-70 f2.8: This is almost always on my camera. Great all rounder, lovely at f2.8 for people shots (you'll get into this, I promise). But, it's big, heavy, a little slow to focus sometimes, sometimes not long enough, and most often not wide enough.
28-105mm: Given to me by my dad from his last film SLR. It's a beauty. Sharp pictures, lightweight, very quick and silent to focus. There's no hunting, it just snaps in. Very uncanny. I often refocus using this one because I don't believe it got it so quickly! Cons: Not wide enough. Oh I wish this was 18-105...
(Can be had for $150-$200 or so second hand. There's a few versions of it though.)
10-20mm Sigma: Wide. R-e-a-l-l-y wide! Most often used at 20mm, but it's outrageous fun at 10mm. Have to be careful to leave
your feet out of the frame in portrait
mode! To be honest though, it's downright useful sometimes, and fun to use for the great distortion, but doesn't get used often enough for me to justify the $600 buying it. (Use panorama stitching software instead!)
50mm f1.8: aka the Nifty Fifty, Plastic Fantastic (avail for either Nikon or Canon). This is another great fun lens to use, because it forces you to move with your feet instead of zooming, and you have to think ahead about your framing. Great for portraits, and the shallow depth of field you can get out of these is something to behold. By itself, wouldn't be appropriate for pics of beautiful European cities, for example. ($140 or so new.)
My signature (and this list) is proof that the bug has bitten me, and I'm not alone here! $1200 for a kit will only get you started! There will be other forum members here laughing at me because I haven't (yet) taken the leap into the $1200+ (+++!) lens price territory...
I think for me, the ideal lens would be something like a 17-85, or even better a -105, but I don't know of one at f2.8. Must check out the reviews of canon's new 17-85 IS... or do I just buy a G9 for travelling!? Aarrgh!
Welcome to the forum. Your first post has generated a pretty good response!
If you just want to take pictures, there is a huge range of point and shoots, and some SLR-like cameras (I had a great Fuji one) that may fulfil your requirements.
If you want to take your photography to the next level, ask a few more questions and jump on in! There are many professional photogs on this forum, who make money doing what they love, and I'm sure they all learn new techniques on a regular basis too.
Paul