Originally posted by jhlxxx
does pentax to sony adapter support full frame? How about the auto focus speed and accuracy compare with pentax k1 + pentax dfa / fa lens?
Every K-mount to E-mount adapter I've seen supports full-frame, even the $5 cheap ones from eBay.
AF speed and accuracy of Pentax K-1 and DFA/FA lenses will generally perform better with K-1 than A7 + E-mount lenses, and certainly K-1 + DFA/FA lenses will have better AF than A7 + Pentax lenses via an adapter (where AF will not work at all).
But it all depends on what your shooting subject is, with what lenses etc. Choose the features that are important to your requirements.
I like the face detection of Sony cameras, for instance, so that's a big plus when shooting people. But the low-light AF of most Sony's (including the A7) sucks - K-1 will autofocus down to [very dark] -3EV for instance, but A7 autofocus only functions reliably while the light remains pretty good [merely down to 0EV].
Note also that the AF of the A7 isn't as full-featured (and fast) as some of the newer Sony's. A7 is old tech.