Don't worry about this trolling stuff, I think a little controversy is healthy, gets the old heart pumpin and the grey cells a jumping!!!! Congratulations on your new acquisition!! In my opinion if you've only got the bucks for one lens a zoom would be the only way to go, now the 16-45 is to limited for the long end, so why not one of the 17-70 (pentax, sigma, tamron) zooms it's still goes plenty wide, and gets you into a very nice range for portrait, detail shots in architecture or landscape. If its going to be your only lens for a long time there's a DA 18-250mm thats been getting alot of attention, with that your a walking lens army all bases covered!! Prime wise I'd go with a DA35 2.8 macro or FA 35 f2, they both give you that classic 50'ish perspective, that I simply love, walking around you see something interesting with your normal eye sight bring the camera up to your eye and the perspective doesn't change... I find it somehow so refreshing...
Regards
Brent
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Changing light gives me the possibility of seeing the world from a new
perspective.
For me photography is a tool for capturing these insights, for reflection and
sharing.