Aperture, Sensitivity, and Flash Range

The range of the built-in flash varies with sensitivity (ISO equivalency) and aperture.

 

Aperture at ISO equivalent of

 

 

Range

200

400

800

1600

3200

6400

m

ft.

1.4

2

2.8

4

5.6

8

1.0–8.5

3ft. 3in.–27ft. 11in.

2

2.8

4

5.6

8

11

0.7–6.1

2ft. 4in.–20ft.

2.8

4

5.6

8

11

16

0.6–4.2

2ft.–13ft. 9in.

4

5.6

8

11

16

22

0.6–3.0

2ft.–9ft. 10in.

5.6

8

11

16

22

32

0.6–2.1

2ft.–6ft. 11in.

8

11

16

22

32

—

0.6–1.5

2ft.–4ft. 11in.

11

16

22

32

—

—

0.6–1.1

2ft.–3ft. 7in.

16

22

32

—

—

—

0.6–0.8

2ft.–2ft. 7in.

The built-in flash has a minimum range of 0.6 m (2 ft.).

In programmed auto exposure mode (mode e), the maximum aperture (minimum f-number) is limited according to ISO sensitivity, as shown below:

Maximum aperture at ISO equivalent of:

200

400

800

1600

3200

6400

3.5

4

5

5.6

7.1

8

For each one-step increase in sensitivity (e.g., from 200 to 400), aperture is stopped down by half an f-stop. If the maximum aperture of the lens is smaller than given above, the maximum value for aperture will be the maximum aperture of the lens.

n

427