Nikon SB-24 instruction manual

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Do not fire flash near the eyes; doing so may injure the retina. Do not touch the flash head when firing the S8-24; it may be hot due to normal operation. Also, be sure to keep plastics and other delicate materials away from the flash head when hot.

Nikon cannot be responsible for malfunctions or other problems resulting from the use of other manufacturers' flash units, cameras or accessories, including external power sources.

In certain cases, due to normal characteristics of the built- in microcomputer, the speedlight may not operate or an abnormal display may appear, even with fresh, properly installed batteries. If such a case occurs, turn off the flash and remove the batteries, then reinstall batteries and turn the power on. This should properly reset the computer.

"Red eye" is a common problem in flash photography. Normally, flash pictures are taken when the surrounding light is dim, and under such conditions the subject'seye pupils will be dilated (open very wide). Red-eye effect occurs when light from the camera'sflash reflects off the interior of the eye and back into the camera'slens. The wide-open pupil allows much light to enter, and as a result, the center portions of a subject'seyes can appear bright red (white in a black and white picture). It is interesting to note that the intenSity of the red-eye effect varies among individuals, and with two people in the same photograph, one may have red-eye and the other may not.

The appearance of red-eye is also based on the angle at which the light flashes on the subject and is reflected back to the camera'slens. If the angle is 2 to 2.5 degrees or narrower, the red-eye will occur. As you move closer to a subject, the angle becomes wider, and the likelihood of red-eye effect decreases. As you move farther from a subject, the angle narrows and the incidence of red-eye increases. When you get very far from a subject, the size of the eye in the picture may become so small that red-eye is not apparent, but when you switch to a lens with a longer focal length, the subject becomes bigger and red- eye may become apparent.

With an angle exceeding 2.5 degrees, red-eye is not likely to occur. For example, with a 35-55mm range lens and when standing about 1.4m (4.5 ft) or closer to the subject, the angle between the flash and lens exceeds 2.5 degrees and red-eye effect will most likely not be visible.

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