Pentax IQZoom 115V IQZoom 115V Manual - Page 23

3. While depressing the shutter release button halfway, re-aim the camera or recompose the picture, then release the shutter. Note: • You can cancel focus lock simply by lifting your finger from the shutter release button. HARD-TO-AUTOFOCUS-SUBJECTS The autofocus system is highly precise, but not perfect. Some subjects may not focus as you wish. In this case, use the focus-lock technique. Subjects which may fool the autofocus system include: a) Black or very dark objects, which don't reflect much light. b) Subjects with horizontal lines, complex or detailed patterns. c) Flickering light sources such as neon signs, fluorescent lamps, TV images, sunlight coming through trees, etc. and subjects illuminated by these light sources. d) Glossy and reflective surface like glass, mirror, car bodies, etc. e) Fast moving subjects. f) Water jets, water surface, smoke, flame, fireworks, etc., which have no distinct or consistent form, or a subject in mist. 21