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Forum: Pentax SLR Lens Discussion
01-10-2015, 06:03 PM
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What you see in the MakerNotes of the EXIF is whatever the decoding program makers had decided that a particular byte or sequence of bytes that the camera put there means. There is no easy way of knowing what gets transmitted between the lens and the camera body through the data pin (it is a two way serial one wire comms), although the various patents do provide some clues. KAF and subsequent mount type lenses (F series onwards) use sliding contacts inside the lens barrel to read the focal length (for zooms) and the focus distance zone. The SR processor then uses this (again as described in the various patents) as input parameters (amongst others). If the lens does not send this information then the camera uses the manually set FL (as for lenses prior to the F series).
Sigma had to reverse engineer the lens-camera communication protocol, with limited success, as is always the danger with reverse engineering :(
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Forum: Pentax SLR Lens Discussion
01-10-2015, 04:13 PM
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Forum: Pentax SLR Lens Discussion
01-10-2015, 12:03 PM
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ExifTool/ExifTool GUI should be able to read it. The camera gets this from the lens.
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