You'd be better served if you reposted in the Nikon SLR Lens forum..........Regards,Hank..
You don't state your primary mode of shooting or need in a lens, so I'll just offer my opinion based on my need for a general-purpose walk-around lens. I'd dump the 28-300 in favor of the 18-200. The gain on wide-end is much more usable than the 100mm lost on the long end..
If the 300 is that important such that you want to keep the 28-300, then you might pick up a FFL (Fixed Focal Length) lens for the wide end..
I have a Nikon D80 with a Tamron 28-300 lens. Would it be woth it toinvest in the Nilon 18-200 lens? I would lose some of the zoom but iam told it has quicker auto focus. I can not justify the expensde ifI would only see marginal differences..
I take a lot of sport action shots of my sons...
For action you need "fast" lens, i.e. 2.8 == lets a lot of light in == allows higher shutter-speed == easier to focus == expensive.These are mostly pro-glass, you can find cheaper in 3rd party lenses...
That is something only you can answer I mean, how far away are you from the subject? Because I fear 100 won't be enough. 200 a minimum and 300 ideal.But like someone else already suggested, Better ask around in the lens-forum...
The main question is...Which end of the zoom range do you use most? The long end or the wide end?.
If the answer is the wide end, then the 18-200 will be the better lens for you. But if you use the long end most, then it is a toss up. The Nikon at 200mm has an aperture of f5.6, while the other lens at 300mm is (I think) f6.3. The slower lens will also be slower to AF as the maximum wide open aperture will affect AF speed. Good fast AF needs a lot of light and the 18-200 will deliver more light for AF..
The greatest of mankind's criminals are those who delude themselves into thinking they have done 'the right thing.'- Rayna Butler..
I am a beginner so some of the language is a little confusing to me. But I think you said the 18-200 is A better choice in close situations. I use the zoom quite a bit for my sons sports teams. Are you saying the 18-200 is also better in zoom situations since it has maximum of 5.6, as compaRED TO THE tAMRON AT 6.3?..