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Forum: Pentax K-70 & KF
06-09-2016, 12:09 AM
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Yup, except now the camera will send a digital signal to the aperture actuator inside the lens at the time the shutter is released, instead of operating the mechanical lever. Think of it as the same thing that happens when the camera asks the lens to focus.
In your diagram, the contact used is almost certainly #6.
See also:
The Evolution of the Pentax K-mount - Articles and Tips | PentaxForums.com |
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Forum: Pentax K-70 & KF
06-08-2016, 11:51 PM
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Well, the camera can communicate with the lens though the digital contact, so all it has to do is send a signal corresponding to the desired aperture (rather than operating the aperture lever), and the lens will obey.
Nikon is doing this with their new "E" lenses. Works exactly the way as the Pentax KAF4 mount, with the same backwards-compatibility consequences. As a result, I don't think KAF4 will be used on all lenses going forward, but rather only on video-oriented lenses until the user base of legacy bodies diminishes significantly.
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