Nikon SB-102 instruction manual Guide Numbers in the Manual Mode

CONTROLS IN DETAIL-continued____

Example 3:

Shooting a subject on land at 8m (26.2ft) without using the wide-flash adapter while using ASAIISO 100 film and "MFULL": The GN for " MFULL" at ASAIISO 100 on land is 32 (from the chart below). Divide the GN of

32by the flash-to-subject distance of 8m to get the correct aperture, f/4. Because water absorbs a great deal of light, however, you cannot use the same GN underwater as on land or your shot will be underexposed. Instead, multiply the on-land GN by 1/2 to 1/3 for under- water photography. (The underwater GNs shown in the following chart are 1/2 of the corresponding on-land GNs.)

Guide Numbers in the Manual Mode

•The values in parentheses are when the Wide-Flash Adaptor SW-102 is being used.

•The full amount of light is emitted when the shooting mode selector is at "MFULL " and, even if not liynchronized, at "AUTO."

Exposure Compensation

When the Nikonos-V is used with the SB-102 in the TTL or non-TTL flash mode, exposure compensation is re- quired for over- or underexposing the picture to match subject or shooting conditions. Each procedure is dif- ferent, so read the following instructions carefully be- fore shooting.

In addition , if you photograph a subject with very high reflectivity, such as a mirror or metallic surface, under- exposure is almost certain to occur. To prevent this, use manual flash control.

TTL Exposure Compensation

When using TTL automatic flash control with the Nikonos-V camera, you can use its ASAIISO film speed dial to make an exposure compensation for the shooting situation or to create intentionally over- or underexposed photos .

The relationship between the exposure compensation value and ASAIISO film speed dial setting is shown in the following chart:

The useable aperture range for TTL automatic flash photography changes according to the exposure com- pensation value being used. Before using the exposure calculation dial to determine the useable aperture range, align the correct shooting situation mark with new (compensation) setting on the ASAIISO film speed scale.

For example, to make a + 2 exposure compensation when using ASAIISO 100 film , reset the ASAIISO film speed scale to ASAIISO 25, then read the modified shooting distance from the dial.

·Positive (+) exposure compensation cannot be made at some film speeds, and negative (-)exposure compensation cannot be made at other film speeds. In these cases, make the necessary compensation in the non-TTL automatic mode (see page 24) or use one of the manual I/ashmodes.

•When you finish making the exposure compensation, be sure to reset the ASAIISO film speed dial on the Nikonos-V and the ASAIISO film speed scale on the speedlight.

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