Ricoh PENTAX K-3 Mark III Faq page 53

1. Set the [Using Aperture Ring] to [ON] in the C6 Function Customization.
2. Set the [Length Input on Startup] to [ON] in the C6 Function Customization.
3. When pressing four-way key right, [MF Lens Focal Length] screen
is displayed. Enter the focal length of the attached lens and select [OK].
Q: Can the 67 format lenses be used with the K-3 Mark III?
A: Yes, you can use them combination with the 67 Lens Adapter K.
Under the default setting, the camera does not operate and display [F- -] in the
LCD panel. Perform the following settings before use.
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