Originally posted by Optical Illusion What you described sounds like it might work with an "A" equipped lens.
That's correct.
Quote: But with a fully manual lens, the camera body cannot set aperture at all,
Right.
Quote: so would the P-Line selection work?
No, it doesn't work with a fully manual lens.
Quote: The camera is metering wide open... so is the process to hit the green button for P-Line, then look at the LCD and manually change to the aperture suggested (on the lens, not the e-dial)?
No. When you have a manual lens, things work different.
I apologize for my previous response. I was clarifying the operation of the Green Button but failed to apply it a manual lens. I'll do that now.
When a lens with a manual aperture is mounted, the operation of the K-x is described on page 284 of the manual.
The first thing you must do is change the "Using Aperture Ring" option in the Custom Setting 4 menu. The default option is "Prohibited". This prevents the camera from firing if a manual lens is mounted, or if an auto lens does not have the aperture set to the "A" position. To manually set the aperture, set the "Using Aperture Ring" option to "Permitted". Now the camera will operate. (NOTE: I don't think you need to do this for a lens without any contacts on the mount...the camera already knows it can't control anything.)
Page 284 describes what happens in the Av and M modes of various lenses. In Manual mode, when the Green Button is set to Optical Preview, you can press the Green Button to meter the scene. While the Green Button is pressed, you can use the e-dial to change the shutter speed and select a speed that provides correct exposure (or, as I like to write, "correct" exposure, because it's not correct...it's standard. You still need to adjust the "correct" exposure for bright or dark subjects.)