In an attempt to 'learn' how to use the distance readout when using the Sigma zoom on my A7rII, I compared distance readout with both exif data and for nearby distances also a tape measure layed out along the ground (so there is some parallax error).
For an example run at a focal length of 21mm I obtained the distance measures (in meters) shown below. Where I show "first-X" it is the closest instance where the display readout changes (when turning slowly) from the previous focal step/distance (there are about 4 rectangle steps at 1m for example for this example in my camera).
If this behavior is consistent, a set of display readouts like this may suffice to cover my DOF requirements when stacking.
It also suggests the poor displayed distance resolution is due to the camera rather than the lens. And from this anecdotal run at least, also that the lens exif data is not a bad indication of focal point. Why not display that rather than integers, particularly at 1m and 2m which is a critical area for landscapes. Something else for Sony to fix?
Aug 19, 2019 at 09:00 PM
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