Originally posted by rayallen Yes, Dave, it is the AF version. Full details: Tamron AF 70-300mm F4-5.6 Tele-Macro 1:2 LD Di A17. It's good value too. I paid about AU$250 in 2008 and it is considerably cheaper now. It has always been sharp and it also does a creditable job as a 1:2 macro...as long as you stand far enough away! It has never disappointed me.
I have that same lens, and so far it has kept me happy and I haven't felt the need to buy a 55-300. I haven't shot it with the K10D yet as it always stays at home in the K-S1 bag... it's used mostly for our kids sports. For playing around with tele, I have the SMC-A 70-210 f4 which I love.
On the Tamron, the "macro" setting works well, I think, in the 180-200mm range, where it's not quite 1:2, it's more like 1:3 or so. But it gets good results. At 300mm where it's 1:2, to me it's just way too soft. Maybe it's my copy that is softer on the long end... but I had the same problem when I had the kit lens (18-55 AL II). I could get good close up shots in the 45-47mm range and even 50mm was still ok, but at 55mm the closeups were not only soft, but washed out without contrast. At least the Tamron has contrast at 300mm
For 1:2 macro, one doesn't need to spend much. The fantastic 50mm f4 Macro (available in K and M versions, and also as M42 Takumar) is great and can be had for 60 dollars most of the time (there's one now at Kenmore Camera for that price, M version, for 59 dollars shipped, exc condition). Friends don't let friends use zooms for macro
I might have posted this one here before... don't remember... K10D and SMC-M 50 f4 Macro.