70-200mm..the right choice?

This is my second post in here although I have been lurking for quite some time now.

I have 40D with 28-135mm IS USM. Just bought 430 EX II and now looking for a much better lens preferably zoom telephoto. I have come up with 70-200 f/4 IS USM which I have tested it and liking it so far.

But, do I really need it? Or should I go for 24-105mm and replace my 28-135mm?

I use my camera mostly for general shots and also often travel all around the world for my job. So, lightweight is a must. I like zoom lens as I can reach much longer distance (I happen to use the long end of my 28-135mm quite often).

So, am I making the right choice of wanted to buy this 70-200? (not 2.8 as I want to avoid the weight).

Can anyone tell me why would you use 70-200? mainly for what kind of photography?

Sorry if I sound weird but I think I'm lost here.

For the same price as the 24-105, you can get a Sigma or Tamron 17/18-50 f/2.8 and the 70-200 f/4 (non-IS). That's what I'd do. Then you'd have 17/18-50 f/2.8, 28-135, 70-200 f/4. Pretty good setup.

Hey, I'm new to this forum, but not to photography.
I have the 70-200mm f/4 IS mounted on my 5D mark II pretty much all the time.

I find that all the shots I take comfortably fit in that focal range. If there are opportunities for a shot I may have missed, it'd probably be something that would require a 24mm, which I lack.

Also depends on what kinda person you are though, some people can't get enough wide angles. On a crop camera the 70-200 was a little too long for my taste, but you have a normal zoom to fill in, so you shouldn't worry.

As for what kind of photography... I guess you can look at my gallery for an idea here. I guess I mostly shoot nature and close-ups among other things.
The stabilizer is pretty wonderful if you learn to use it properly. with some steady hand holding, I can manage to get a sharp photo at 1/4th a sec @ 100mm. If it's gonna be useful at all to you depends on if you decide to shoot relatively still subjects in low light.

Kolor-Pikker wrote in post #8392122
Hey, I'm new to this forum, but not to photography.
I have the 70-200mm f/4 IS mounted on my 5D mark II pretty much all the time.

I find that all the shots I take comfortably fit in that focal range. If there are opportunities for a shot I may have missed, it'd probably be something that would require a 24mm, which I lack.

Also depends on what kinda person you are though, some people can't get enough wide angles. On a crop camera the 70-200 was a little too long for my taste, but you have a normal zoom to fill in, so you shouldn't worry.

As for what kind of photography... I guess you can look at my gallery for an idea here. I guess I mostly shoot nature and close-ups among other things.
The stabilizer is pretty wonderful if you learn to use it properly. with some steady hand holding, I can manage to get a sharp photo at 1/4th a sec @ 100mm. If it's gonna be useful at all to you depends on if you decide to shoot relatively still subjects in low light.

Agreed. If you are looking for a quality zoom you can't go wrong with the 70-200 f/4 L IS. It is a little long on a crop sensor but its a zoom. You wanted more reach right? A crop gives you that.

But, be warned. Once you enjoy the quality that this lens gives you - you might find you need a shorter focal length lens with equal quality. Once you go down that path, there is no turning back...

Haha, I was totally gonna write something along those lines at the end of my post but thought it was gonna add hyperbole...

Oh yeah, as SCOTTinNJ said, you may want to replace your 28-135mm sometime down the line with a 17/18-50/55 crop zoom if you have no plans to upgrade to full frame (seeing as you pack light, that would probably be a no)
Such a lens has a more reasonable focal range for a crop camera and the 15-20mm gap that would result is insignificant.

Not sure I was really suggesting replacing the 28-135, but if money is an issue then I'd certainly do that (and did myself, actually). And yes, 17/18-50 and 70-200 combo is very nice. I wouldn't miss the 50-70 range much, but I would find myself switching lenses a lot if walking around on vacation or such. In which case the 28-135 would slot in nicely.