Ricoh PENTAX K-3 Mark III Faq page 54

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].
Memo:
- When the aperture is set to a position other than the A position, the correct exposure
can be obtained by the following method.
1. Set mode dial to M.
2. Set the lens aperture ring to the desired aperture value.
3. Press green button.
Shutter speed is set to the appropriate value.
4. Adjust ISO sensitivity if proper exposure cannot be achieved.
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