Right now I use a Sakar 1.7 teleconverter and its not
horrible but I wouldn't mind upgrading to something of
better optical quality.
I've been looking for one the well regarded
kenko/tamron pro ones but they are pricey and hard to
find in pentax mount.
What are the pentax ones like for optics?
I'm especially interested in the 1.7X F AUTO FOCUS
ADAPTER so I could use that with my K 200mm f2.5 and
end up with an auto focus 340mm f4.25 that will
autofocus.
Also the A 1.4X-S and A 2X-S.
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