Let's cut the ^&%: (don't quite remember how the saying goes)
- the Pentax D FA* 70-200 f/2.8 is optically superior to the Tamron. Yes, it renders nicely. No, the Tamron isn't bad at all.
- the D FA 70-210 is a customization of the Tamron 70-210, because there are changes other than what's required to convert it to a Pentax mount. I expect at least better flare resistance.
- the Pentax version might use different glass types in some of its elements, and Pentax coatings. Note the might; note that I said "I don't quite believe this" - this is a hypothesis I specifically want to be tested before saying it's true.
I'm leaving this for people to see what I'm actually claiming. As mst requested, the discussion is over.
- the Pentax D FA* 70-200 f/2.8 is optically superior to the Tamron. Yes, it renders nicely. No, the Tamron isn't bad at all.
- the D FA 70-210 is a customization of the Tamron 70-210, because there are changes other than what's required to convert it to a Pentax mount. I expect at least better flare resistance.
- the Pentax version might use different glass types in some of its elements, and Pentax coatings. Note the might; note that I said "I don't quite believe this" - this is a hypothesis I specifically want to be tested before saying it's true.
I'm leaving this for people to see what I'm actually claiming. As mst requested, the discussion is over.