Originally posted by beaumont Thank you all for the feedback, and the examples. Sounds like a person can't go wrong with either as there seem to be no significant knocks on either lens. Hopefully this newby will return some knowledge back to the forum some day...
personally, i recommend going with one brand or the other for your beginner kits. if you've got the Pentax 18-55, get the Pentax 50-200. if you've got the sig, get the sig.. if you've got a tam, get a tam..
simple reasoning behind this is that you get a unified look, seeing as how each optic formula produces different looking results from the other brand, and companies tend to have most of their stuff look the same. oh, and color cast from glass isn't as noticeable if you have all the same brand