Originally posted by dtmacias he told me to sell the Kr and either purchase a Nikon or Cannon and my photography problems would be over.
What he means is that he doesnt have a clue about Pentax gear and it would make his life easier if you were just another clone. Ask him to explain why your K-r is a better camera for the money than anything C or N make in the price range and then ask him why the big two don't make small beautiful fast and (relatively) inexpensive prime lenses like Pentax do, ask him why you should spend twice as much money to get comparable gear from Canikon and STILL have the same camera problems...and then tell him to ...well never mind...
The answer to your question comes down to three things
1 what do you want to shoot and under what conditions (I'm thinking subject/portability/weather conditions)
2 how much do you want to spend/how important is value versus IQ
3 how flexible do you need it to be?
There are many lenses in the Pentax range that will do a stellar job of making landscape pictures, from the tiny jewel that is the Da*15mm through to someting like the DA 12-24 which is a beast (in pentax terms, still smaller than anything comparable from you know who) , any of the fabulous FA* lenses (31, 42, 77), or even something wild like the fabulous DA* 60 -250 to isolate features in the landscape.
You want an 'all purpose lens'? Have you looked at something like the Tamron 18-250 (which was my starting point in lenses, and my other half now uses exclusively) There is a Pentax variant of this lens if I recall. It is a good lens as far as it goes, and for the job it does, but it is not first class in IQ terms.
Is weather sealing important to you? If so the 18 -135 would be a good all rounder. I have no direct experience with this lens, but from my reading it seems to be a very good 'bang for the buck' proposition.
My inclination is to rate the IQ of the 17-70 slightly above that of the 18-135 just because of the zoom range, (but I have no direct experience with either lens, this only comes from reviews and the physics of making a longer range zoom)
Oh, and ask your camera club leader...if all one has to do is to buy a Nicanon camera to solve all ones camera problems...why are there so many camera classes, 'how to' workshops, on line blogs, etc trying to solve the camera problems of all the Sheeple's out there? Sheesh....
Last edited by wizofoz; 03-18-2012 at 04:14 PM.