Originally posted by JohnBee Wow that's somewhat disappointing...
I was really hoping to use live-view AF to overcome slower lenses with my AF TC rather then conventional AF, but now I'm not sure its going to work at all...
Also can you explain the difference between Phase and contrast AF?
Phase detect AF uses the same AF hardware which is used for Viewfinder work.
Contrast detect uses the Live-View image feed directly - the same way P&S cameras do AF.
On the K-7, Phase detect is usually faster and more accurate in good light.
The advantage of Contrast detect becomes very apparent in failing light.
Typically SAFOXVIII AF starts to lose speed and accuracy dramatically in failing light before shutting down altogether. CD makes use of the sensor's High-ISO boost capability to get a brighter image during AF and lock AF even in lighting where SAFOX VIII PD would have given up.
CD is slow on the K-7, a lot faster it seems on the K-5.
My K-5 won't be delivered until late November
, so I'll have to wait a while more to check it out...