Originally posted by Buddha Jones I doubt you will get HSM, but you never know.... but if you are looking for a HSM TC, let me know, I have just the thing.
Originally posted by John Kovarik The Promaster 1.7 will engage the SDM on the Da*s but will not complete the focus. At least that has been my experience on my K20. !t works fine on non-SDM AF and IQ is excellent.
I get SDM too--it has the Powerzoom contacts (I think, like Tamnron cousin, it's labelling includes "Pz" designation--but that's from memory). In poorly lit rooms last night it was hunting like crazy but would
sometimes get focus confirm. Sometimes it would get there with some quickshift help (either mostly there & I finished, or I helped it get close and SDM AF finished). I
think that was a low light issue but don't have it at hand to test now that there's light.
I did find that the contacts were a bit fussy.
Sometimes the F-setting communication would drop out and my display would read "F--" rather than the f-stop (F-- is right!). But other times it remained coupled just fine. May be a wee bit of give to the mount, or maybe my contacts need cleaning.
But I'm shocked that DA*50-135 +
this TC is a viable combination. I'm still posting a WTB for a 200 (here
https://www.pentaxforums.com/forums/wanted-items/50701-alternative-new-da-200...tml#post485133) but it's nice to know that I can pack light and still get results I'll be happy with out to 230mm.