Nikon SB-24 Instruction Manual

Also see for SB-24: Instruction manual

Contents

NOTES-------------------------------=~~~~~ ·Do not fire flash near the eyes; doing so may injure theretina. Do not touch the flash head when firing the S8-24;it may be hot due to normal operation. Also, be sure tokeep plastics and other delicate materials away from theflash head when hot.Nikon cannot be responsible for malfunctions or otherproblems resulting from the use of other manufacturers'flash units, cameras or accessories, including externalpower sources.In certain cases, due to normal characteristics of the built-in microcomputer, the speedlight may not operate or anabnormal display may appear, even with fresh, properlyinstalled batteries. If such a case occurs, turn off the flashand remove the batteries, then reinstall batteries and turnthe power on. This should properly reset the computer." Red eye " is a common problem in flash photography.Normally, flash pictures are taken when the surroundinglight is dim, and under such conditions the subject's eyepupils will be dilated (open very wide). Red-eye effectoccurs when light from the camera's flash reflects off theinterior of the eye and back into the camera's lens. Thewide-open pupil allows much light to enter, and as a result,the center portions of a subject's eyes can appear brightred (white in a black and white picture). It is interesting tonote that the intenSity of the red-eye effect varies amongindividuals, 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 atwhich the light flashes on the subject and is reflected backto the camera's lens. If the angle is 2 to 2.5 degrees ornarrower, the red-eye will occur. As you move closer to asubject, the angle becomes wider, and the likelihood ofred-eye effect decreases. As you move farther from asubject, the angle narrows and the incidence of red-eyeincreases. When you get very far from a subject, the sizeof the eye in the picture may become so small that red-eyeis not apparent, but when you switch to a lens with alonger focal length, the subject becomes bigger and red-eye may become apparent.With an angle exceeding 2.5 degrees, red-eye is not likelyto occur. For example, with a 35-55mm range lens andwhen standing about 1.4m (4.5 ft) or closer to the subject,the angle between the flash and lens exceeds 2.5 degreesand red-eye effect will most likely not be visible.5