FUJICA AX-3 Owner's Manual page 34

to you for taking scenic, portraits, snapshots, etc.
There are two types:
X-Fujinon DM Lenses {Lenses with an Orange Mark on the Aperture Scale)
These are capable of full aperture metering and programmed, shutter-
preferred, and aperture-preferred automatic exposure.
However, your Fujica AX-3 is provided for full aperture metering and
aperture-preferred automatic exposure only. Do not set the Aperture Ring
to the orange (diamond) mark.