Olympus OM System OM-1 Instruction Manual page 73

Press the shutter button halfway or press the AF-ON button to focus; the
camera then tracks and maintains focus on the current subject while the
button is held in position.
In movie recording mode, the camera keeps continues AF tracking even
if you release the button before you start recording. To stop it, press the
Q button.
When you start recording a movie while the camera is tracking the
subject, it will continue tracking.
C-AF+TR
• The AF target is displayed in red if the camera can no longer track
(AF tracking)
the subject. Release the button and then frame the subject again and
press the shutter button halfway or press the AF-ON button.
• Autofocus does not work while the AF target is displayed in red even if
the camera is tracking the subject.
• Tracking AF cannot be used with:
Pre b The camera automatically focuses on the preset focus point when
shooting.
(Preset MF)
F AF
Choose this mode for pictures of stars in the night sky. Press the AF-ON
(Starry Sky AF)
button to focus on the stars. g "Using Starry Sky AF" (P. 74)
(only during
photo shooting)
# [S-AFb] only appears in [nAF Mode]. To focus manually during autofocus when
taking pictures, use [KAF+MF]. g "Combined Auto and Manual Focus (K AF+MF)"
(P. 82)
# The camera may be unable to focus if the subject is poorly lit, obscured by mist or smoke,
or lacks contrast.
# When using a Four Thirds system lens, AF will not be available during movie recording.
# [AF Mode] selection is not available (P. 292) when the lens focus ring is in the MF
position and [Operative] is selected for [MF Clutch] (P. 104).
%The Fn lever can be used to quickly switch the AF mode. g "Customizing the Fn Lever
(Fn Lever Settings)" (P. 219)
%You can choose whether to focus when the shutter button is pressed halfway.
g "Configuring the AF operation when the shutter button is pressed (KAF by half-
pressing a)" (P. 83)
keystone compensation, High Res Shot, focus bracketing, focus
stacking, interval-timer photography, HDR photography, the live ND
filter, or fisheye correction.
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