I've been unhappy with my DA*16-50 from the start. It seemed to produce smudgy images. About 10% of the time, I'd get a sharp one, and second guess that it was the idiot holding the lens that was the problem... after all, with the bad rap and the fact that the first copy I had was DOA out of the box, perhaps I was prejudiced - and I know I'm not a good photographer, so there's that ..
After a couple quick tests against the kit lens, however, I decided the DA* was crap (or at least no better than the kit for 3x the price and weight) and ordered a Tamron with the intent of doing a 3 way test. If the Tamron was better I could sell the DA*, have sharper pictures, and come out $300 ahead.
I took a "brick wall" series of pictures across 7 focal lengths and two apertures with the three lenses and intended to post the dirt on the DA* when I saw that almost - but not all - the Tamron pictures were out of focus. I had AF-S on, so the picture shouldn't even exist of the camera didn't think the shot was in focus, but here's a center crop f2.8@~24mm
I tried again on a different wall, and this time, I reset the focus before every shot and made sure the AF activated. The results were puzzling. I have only posted a few of the f2.8 samples from the DA* and the Tamron, as the other photos were similarly lacking usefulness.
Here is the wall:
Center crops:
pentax DA* @ 16mm on the top. Tamron @ 17mm on the bottom. Neither impress me.
DA*@24 on top, Tammy@24 on bottom. Well the pentax looks a little better, but what's with the Tamron - isn't it supposed to be ridiculously sharp?
DA*@35 on top again. Well the Tamron crisped up, but now the Pentax sucks..
The lower right corners, just to add to the mystery:
DA*@24 on top again. How the heck is this even close to in focus?
DA*@35 on top
So, if you've managed to stay through all that, what's the verdict? Did I win the POS lottery and have two bad lenses on my hands, or is it time to suspect there's something wrong with my camera?