The 50-200mm doesn't cover the 18-50mm range the 18-55mm can. So don't sell it unless you don't need those range, which I doubt.
Check out the Tamron/Pentax 18-250mm. As rei mention, super zoom lens aren't that good as there are compromises to be made to achieve the large zoom range. However, this doesn't seem to apply to the 18-250mm.
I think thats true. i find that the 18-50mm lens is easier to use as well, but i still prefer the 18-250mm lens...coz it is too much work taking 2 lenses around...but again, due to my budget, i will take ur advise to keep the two lenses.
Through out my recent practice, I find it is very hard to take pictures in shutter priority mode, since the vibration reduction not so effective in this mode...i can only hold the camera steady enough at around the speed of 1/8s or faster. im wondering if u guys can provide me some tips in taking pictures in slow shutter speed??
Also, the 4 batteries that comes with the camera are about to die, what kind of batteries (rechargeable or not, doesnt matter) u guys think is a better choice, or any particular one u have used that also works, please let me know. Thanks a lot!!