Pentax IQZoom 700 Operating Manual page 19

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B While pressing the shutter release button half-way, re¬
aim the camera or recompose the picture, then release
the shutter.
Notes:
• You can cancel focus lock simply by taking your finger
off the shutter release button.
• When in the Consecutive Shooting mode {^}, focus
lock cannot be used.
Hard-to-autofocus subjects
Like many other autofocus cameras, this camera's
autofocus system is highly precise, but is not almighty,
so it may not focus as you wish on certain subjects. In
such cases, use the focus-lock technique on a subject
which is both near the actual one and equidistant from
the lens.
Subjects which are hard to autofocus include:
1. Black objects like hair, which don't reflect much
light (and therefore don't reflect infrared autofocus
beams}.
2. Wire netting, latticework, iron exercise-bars, etc.
3. Flickering light sources such as neon signs, fluo¬
rescent lamps, TV images, sunlight coming through
trees, etc., and subjects illuminated by these light
sources.
4. Glossy and reflective surfaces like glass, mirrors,
car bodies, etc.
5. Fast-moving objects, like trains in motion.
6. Water Jets, water surface, smoke, flame, fireworks,
etc., which are formless.

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