Originally posted by jspi I see 2 spots on the glass but neither have appeared in any image.
You see two spots of dust behind the front element I suppose.
After a couple of year of use, there were two dust spots visible from the front of the lens. I unscrewed the front group and the dust was just behind, blew so air and mounted the front goup again.
AF motor is slow of that 24-70 f2/8 Tamron, it is so for Nikon and Canon mount, it's by design.
Originally posted by jatrax Everything is subjective but I've not found the 24-70 to be slow compared to other Pentax lens
The Pentax DFA24-70 is the slowest to focus lens compared to the Pentax DFA28-105 and all other DFA lens in the FF lineup.
The DFA24-70 is only a little faster than SDM lenses such as DA*16-50 SDM, DA*50-135 SDM, DA*60-250 SDM or DA*300 SDM.
---------- Post added 16-02-20 at 09:14 ----------
Originally posted by jatrax On the contrary it is much faster than (for example) the DA 60-250, DA 300, DA 16-50.
My impression, feeling, is it's not much faster. I'd say a little faster. In english, if I'm not wrong, "much" mean "a lot", like 50% or 100% faster is much faster, but 10% faster would be a little faster , in my opinion.