Originally posted by csa Wow, that is surprising! What made you disappointed; sharpness or what?
Well, I'll try to make it as short as possible ...
The lens used: DA*300/4 ... yes I know, it isn't the best lens to use with a TC but that is all I have for tele.
Anyway, a while back I had been using the Tamron (as you described) and got fairly good results as far as "optical" performance was concerned.
I also used the Pentax 1.7x TC (which I still have) and also obtained good results ... a bit awkward to use but nonetheless quite once when you get used to it.
Then, as mentioned earlier, sold the Tamron to get this "excellent" Pentax HD 1.4x TC: with the same lens (DA*300/4) I am getting at least 8 out of 10 shots blurry.
So, I suppose this could be a lemon ? I have yet to send the entire gear (lens and TC) to have the folks at Ricoh (Canada) figure out the problem.