Manual Flash Control

Manual flash operation allows you to control the light output of the SB-102 by setting the shooting mode selector to one of three positions : "MFULL," "M1/4," or "M1/16."

To determine which setting to use, begin by aligning the correct shooting situation mark with the correct speed on the ASAIISO film speed scale. Next, Ipcate the flash-to-subject distance on the distance scale and follow the corresponding distance line up as it crosses the aperture scale. At each intersection between the distance line and an f/stop line on the aperture scale, one of four conditions will be present: 1) the distance line will intersect the extreme right-hand edge of the f/stop line (the "MFULL" mark), 2) the distance line will intersect a semicircle (the "M1/4" mark), 3) the dis- tance line will intersect a triangle (the "M1/16" mark),

Example 1:

When shooting a subject underwater at 1m (3.3 ft) with- out using the wide-flash adapter while using ASAIISO 100 film, you can select one of three aperture/mode settings: f/16 at "MFULL," flS at "M1/4," or f/4 at "M1/16."

If the shooting distance changes to 5 m (16.4 ft) but you still want to use "MFULL," you should use an inter- mediate aperture setting between f/2.S and f/4.

To determine the correct f/stop without using the expo- sure calculation dial, divide the GN (trom the chart on page 26) by the flash-to-subject distance (in meters).

or 4) the distance line will intersect an unmarked portion of the f/stop line. The first three conditions indicate the manual flash mode that can be used at those particular f/stops.

Before shooting, set the shooting mode selector to correct position and set the correct aperture on the lens.

Example 2:

When shooting a subject underwater at 4 m (13.1 ft) without using the wide-flash adapter while using ASAIISO 100 film and "MFULL," divide the GN (16) by the shooting distance [4m (13ft)] to get the correct aperture (t!4) .