Pentax K1000 Manual page 7

USING SMC PENTAX-A/-F LENS
The K 1000 camera is primarily designed to work
more suitably with the SMC Pentax or SMC
Pentax-M lenses. Therefore, when you use the KA
mount lens or KAF mount lens like the SMC Pentax-
A or SMC Pentax-F lens on your K1000 camera,
it must be operated slightly differently from
the other two types. Namely, be sure to set the
diaphragm ring to any proper f-stop other than
"A" (Auto). (If the diaphragm is accidentally set
to the A position, it will automatically be set to
the minimum f-stop, causing improper exposure to
be made.)
8 To release the diaphragm ring from the A position,
just turn the ring, as illustrated, in the direction of
the arrow while depressing the Aperture Auto Lock
Button also indicated by the arrow.
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