Argus Camera ARGUS A2 manual Stop, Film Speed Read Shutter Speed from the block

Fig. 5-3 : Example 1 Fig. 5-4: Example 2

Example 1 Film: 100 ISO (72 Weston)

The second block is visible in the extinction meter. You are outdoors with average lighting conditions.

Use the following Shutter Speed/Aperture combinations:

Shutter Speed	200	100	50	25
f-stop	f/4.5	f/6.3	f/9	f/12.7

Table 5-2: Equivalent Shutter Speed/Aperture combinations for Example 1

Example 2 Film: 50 ISO (40 Weston)

The third block is visible in the extinction meter. You are outdoors with bright lighting conditions.

Use the following Shutter Speed/Aperture combinations:

Shutter Speed	200	100	50	25
f-stop	f/6.3	f/9	f/12.7	f/18

Table 5-3: Equivalent Shutter Speed/Aperture combinations for Example 2

V.If you are using film that is faster than 100 ISO (200 ISO, 400 ISO, etc.), you must use the shutter speeds above the one next to your desired f-stop. Each time the speed of the film is doubled (100 to 200, 200 to 400, etc), you must use one shutter speed faster.

For example, assume that you want to use f/18 and the Extinction Meter indicates that you should use a speed of 5 (1/5th of a second). If the film speed is faster than 100 ISO, you should use the speeds above 5 according to the chart below:

Film Speed	Read Shutter Speed from the block:	Shutter Speed
100 ISO	To the left of the f-stop	Use 5
200 ISO	Above the block next to the f-stop	Use 25
400 ISO	Two blocks above the block next to the f-stop	Use 50
800 ISO	Three blocks above the block next to the f-stop	Use 100
1600 ISO	Four blocks above the block next to the f-stop	Use 200
	Table 5-4: Example Shutter Speeds for higher film speeds

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