Originally posted by corvaz Shouldn't it work for K1?
"F--" in the status display just means that the camera does not detect a lens that supports aperture control from the camera.* It most often occurs with adapted lenses and original K and M series lenses that lack the required mount contacts. Since your FA series lens does have the required contacts, the usual cause is not having the aperture ring locked in the "A" position so that those contacts are enabled.
Steve
* When F-- is displayed, all automated exposure modes default to Av mode with the lens remaining wide open regardless of aperture ring position. Manual modes (M, X, and B) continue to be operational except that metering is limited to stopped down methods using the green button or optical preview lever. P-TTL flash is also not available.