Extended User Manual – Irix 15 mm f/2.4
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FOCUS RING LOCK
The focus ring lock allows you to fix the focusing
ring in a selected position. This innovative feature
helps prevent accidental movement, resulting in
focus shift.
You may want to use the focus lock during long
exposures, time-lapse imaging, or whenever re
-
petitive shots are called for. You can also use it to
avoid changing the focus setting while mounting
or removing the lens or to retain the focus setting
when storing it in a bag, case or backpack.
Landscape photographers, street photographers
and journalists can utilize the focus lock to keep
the lens at the infinity setting or hyperfocal distan
-
ce for a given aperture.
To use the focus lock, focus the lens, then rotate
the locking ring in the direction of the “lock” arrow
until you meet resistance. Don’t over-tighten. To
unlock, rotate the ring in the opposite direction
until “unlock” aligns with the top of the lens.
CAUTION: Forcefully rotating the focus ring with the lock enga
-
ged may cause permanent damage to your lens.
