Pentax KB21070BC IQZoom 80S Manual - Page 21

3 7 II 3 While holding the shutter release button halfway, re-aim the camera or recompose the picture, then release the shutter by depressing the shutter release button all the way. Note: • You can release the 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 on another subject near the actual one and equidistant from the lens. Subjects which may fool the autofocus system include: a) Black or very dark objects, which don't reflect much light (and therefore don't reflect infrared autofocus beams.) b) Wire netting, latticework, iron exercise-bars, etc. 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 surfaces like glass, mirror, car bodies, etc. e) Fast-moving objects, like trains or automobiles in motion. f) Water jets, water surface, smoke, flame, fireworks, etc. which have no distinct or consistent form, or a subject in mist. 19