Originally posted by Ben_Edict Congratulations. My own copy (old, pre-HSM, pre-Macro) is very sharp indeed and the old K 200/2.5 has only the slightest advantage, when both lenses are used fully open – but the Sigma has much better colour correction.
Hi Ben, thanks for the note. That's an interesting comparison with the K 200/2.5 - were you the one who posted some shots taken with this lens not too long ago? Also, by colour correction do you mean CA correction? If so, I agree - the Sigma barely shows any CA.
Originally posted by Ben_Edict It's a shame, that the beautiful Tokina isn't en par optically. In my own experience that is true for a couple of Tokina lenses: great build, but not so great optics. The worsed was the ATX 80-400, which I found virtually unuseable and finally sold (the buyer is happy, though).
It really is a shame - it sounds like you have handled one. If so, you'll know what I mean when I say that just holding it made me want to buy it - beautiful all-metal barrel and lens hood.
Needless to say I was surprised and dismayed by the disappointing IQ, as I knew that Tokina lenses from the MF era were well-regarded. I have a MF Tokina AT-X 35-70/2.8 which works beautifully. It does suffer from a little bit of bokeh CA, but not nearly to the degree exhibited by the AT-X Pro 70-200/2.8. What happened with the switch to AF?
Actually, the Tokina wasn't too bad at 200mm, but like I mentioned it did suffer badly from bokeh CA (at all FL's). This has been confirmed by an owner of this lens. Also, for some reason the copy I tried was really bad (unacceptably) at 100mm. Since I did not need another 200mm prime, and the Sigma had better IQ, so I picked the Sigma.
Here's a crop from the Tokina at 200mm/f2.8:
This shot does suffer from some shake due to the SR not being ready, but it was the best one out of several attempts.
Here's another crop in an out-of-focus area showing the bokeh CA:
And for comparison a similar crop from the Sigma: