Originally posted by Spock The large and clunky Pentax and Tamron/Pentax F4-5.6 versions have absolutely no advantage over the compact and faster F3.2-4.5 version - unless you really want the original version's powerzoom feature.
To be honest, the 3.2-4.5 is the lens I wanted. It is smaller, lighter, and faster, and if it is also optically superior then of course that is great too.
As I say though, I have bought two already and had to return both because of the focusing, so I am considering the power zoom as a second choice.
Of those who have used the 3.2-4.5 without any problems, are any of you using it on a k-r.
If anyone else has had luck with that combination, I may just be tempted to try again.