2

I've upgraded K-S1 camera firmware to latest version, played with some settings and reset them to defaults.
For some reasons, manual (K) lenses aren't accepted anymore. Modern auto-focus lenses work fine but for my old lenses, the camera doesn't show focal length setting when turned on. Display shows flashing F-- and I can't take pictures in any mode.

3

To use manual (K) lenses, Using Aperture Ring in menu C4 - 26 needs to be enabled (not enabled by default) - check user's manual, p. 85 - Setting the Focal Length.

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