Originally posted by vinceloc Use the focus assist. When the green polygon shows up on the viewfinder and remains steady, shoot!
Originally posted by One3rdEV With the OVF, using the 'Catch in focus' mode is another option. For example; when this mode is set the shutter release button is pressed and held, while the focus to the lens is rotated, then when the subject comes into focus at the user specified AF sensor (e.g. center sensor) the camera will automatically actuate the shutter.
These two methods both use the PDAF system and are equivalent in regards to ability to detect an out of focus condition with catch-in-focus being somewhat less effective for real world use. When used with the center column focus points and a lens f/2.8 or faster both are about a stop better than the optical viewfinder with stock screen on the K-3. On the K-1, I am not sure which, PDAF vs. optical focus, is more effective (better focus sensitivity).
Probably the best approach is to do comparative tests with a non-ambiguous subject* tallying the number of successful (acceptably sharp) focus attempts out of 20 for each method.
Steve
* Typically a lens resolution test target mounted on a flat surface parallel to the camera sensor at about 20x - 40x the lens focal length. The aim is to make it as easy as possible to attain focus with the least number of uncontrolled variables.