Pentax smc -FA Operating Manual page 10

8
[Zoom Lens]
Aperture index
{long focal length}
Aperture A-lock
button
Note: The following lenses do not have an aperture ring: FA J 18-35mm
f/4-5.6AL, FA J 28-80mm f/3.5-5.6AL, and FA J 75- 300mm f/4.5-5.8AL.
The aperture is controlled at the A [Auto] setting. Therefore, the lens is not
compatible with cameras and accessories which are not compatible with
the A setting.
Focusing ring
Distance scale
Zoom ring
Aperture ring (note)
Aperture index
{short focal length}