Nikon SB-21 instruction manual With lens in normal position

1. Turn the film speed ring on the controller's

aperture/reproduction ratio dial until the film speed index is opposite the film speed

in use.

The two dots between the numbers on the film speed scale stand for intermediate settings.

Full light output

1/4 light output 1/16 light output

2 Turn lens selector knob to

• set lens index.

With lens in normal position:

Set the lens index on the controller to the focal length of the lens in use. With lenses not listed on the scale, use intermediate settings.

With lens in reverse position (55mm Micro·Nikkor or 20mm to 35mm Nikkor lens only):

Set lens index to the red " RE- VERSE " position .

3 Determine proper aperture for desired			Follow the white line (tor lens in normal position) or red
	• reproduction ratio.		line (for lens in reverse position) from the reproduction
Each of the aperture indicator lines are marked with			ratio scale for the desired reproduction ratio until the
			white or red line intersects the light output index on the
light output indexes. The light output indexes at the left
			aperture indicator, then read the flstop indicated.
are for full light output, the center indexes for 1/4 light
			For example, with ISO 100 film and the Micro-Nikkor
output, and the right ones for 1/16 light output.
			55mm f/2.8 lens in normal position , to obtain 1:5 re-
I ~----------------See page 48 for determining aperture accord ~\			production ratiO, use f/8 for 1/16 light output, f/16 for
			1/4 light output or f/32 for full light output. For usable
\	ing to the shooting distance.	J	aperture with a reproduction ratio lower than 1:10, seA
	~----------------~		page 40.

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