with the 16-85 and 70-300 combo you are gaining a little more at the wide end and a little more at the tele end. You will not notice any difference in photo qualities on prints at 11 X 17 as compared to the 18-200mm!!!
I could notice the difference at much smaller print sizes, because my 18-200 was also lacking in contrast, and exhibited strong barrel distortion at the wide end. These characteristics were easily noticeable despite the print size used.
There is a lot of hype and emotion around having two or three lense systems. They cost a lot more for no significant improvement in IQ. I mean in this particular case because all these lenses are very good. Similar.
Again, I have to disagree.
Also, my 18-200VR wasn't particularly accurate focusing at 200mm at long distance, or at close up ranges at 200mm.
My 16-85VR is far more reliable, as far as AF is concerned, across its entire range, plus distortion is noticeably less, and contrast is better.
Meanwhile, the 70-300VR has very good AF at long distances, and surprised me by being quite good at constant AF on moving subjects.
the 16-85 is not any faster than the 18-200. In the 16-85 range, distortion is similar (not siginificantly different to make a difference).
Quite different, imo. About half the distortion at 16mm compared to 18mm on the 18-200VR.
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For me, I am finding that I don't need anything else but the 18-200 for all around daily usage. For a second lens, I am searching for a fast f1.4 or f1.8 type of lens which would go along with the 18-200 and would be completely different and in its own category than the 18-200. Why would I switch from the 18-200 to get two lenses that do practically the same thing except for more reach.
Why? For you, you shouldn't. You don't discern any practical difference so it would make no sense for you to switch. But for myself and some others, we DO notice the difference and are happy to make the switch. I lived with the 18-200VR for a year so I'm well aware of its characteristics, both pros and cons. Having had the 16-85VR + 70-300VR combo for about a year now, I'm also very cognizant of the net improvements resulting from the switch.
larsbc