Pentax smc -FA Operating Manual page 26

When the focus range-limiter is set to
"MANUAL", you can adjust focus manually.
The focus range limiter may not turn where
the focus range changes between long and
short distances.
Using with the K -mount cameras, manu-
AF2
al focus will work with the focus-range lim-
iter is set to MANUAL in autofocus mode.
★
FA Macro 200mm f/4ED (IF) lens has a
focusing ring which provides autofocus and
manual focus settings. Push the focusing
ring forward or pull to change the focus
mode from autofocus to manual.
Focusing range
Limiter set
FA Macro 100mm f/2.8 0.306m(1x) - 0.57m(1/4x)
FA ★ Macro 200mm f/4ED (IF) 0.514m(1x) - 0.7m(1/2x)
24
With the K -mount camera, when the
AF2
focusing ring is set to MANUAL, the shutter
cannot be released unless the focus indica-
tion appears in the view finder if camera is
set to the autofocus mode (AF single
mode).
Short-distance range Long-distance range
Approx.0.6m - infinity
Approx.0.7m - infinity