Luminous Landscape Forum
Equipment & Techniques => Medium Format / Film / Digital Backs – and Large Sensor Photography => Topic started by: Mike Sellers on November 10, 2015, 09:37:51 pm
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How does true focus work? Does it invoke the hyperfocal point so that everything is in focus from near to far?
Mike
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You focus until you hear the beep (or get the "true focus" confirmation indicator in the VF, and then recompose. It pushes your focus back to the point that you "beeped" on - where you indicated you wanted to focus. Hyperfocal doesn't come into play. Not really a factor below about 5.6, but wider than that, it's noticeable. I'm shooting H5X and use it every shoot.
-Doug
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Basically, it uses an interior sensor / accelerometer to track how you moved the camera after locking in "true focus" (as Doug described). It then compensates for those movements at the moment of capture. So, you focus, get the beep / true-focus confirmation, release the TF button, recompose, shoot. It senses how you moved the camera / recomposed, and it compensates for the change in focal distance to the subject.
FYI it can't compensate for forward / backward or up / down movement of the camera. It compensates for angle changes, as if you are on a loose tripod head and the camera is stationary but swiveling around a single point.