Tips on Speedlight Care and Reference Information

Specifications

Guide number table

The SB-500 guide numbers differ depending on the camera’s ISO sensitivity and flash output level.

ISO 100; m/ft

Flash output

1/1

1/2

1/4

1/8

1/16

1/32

1/64

1/128

level

 

 

 

 

 

 

 

 

Guide number

24/

16.9/

12/

8.4/

6/

4.2/

3/

2.1/

78.7

55.4

39.3

27.5

19.6

13.7

9.8

6.8

 

Guide number table (for auto FP high-speed sync)

ISO 100; m/ft

Flash output

1/1

1/2

1/4

1/8

1/16

1/32

1/64

1/128

level

 

 

 

 

 

 

 

 

Guide number

10.1/

7.1/

5.1/

3.6/

2.5/

1.8/

1.3/

0.9/

 

33.1

23.2

16.7

11.8

8.2

5.9

4.2

2.9

•Guide numbers in the above tables are for when the SB-500 is used with a D4 camera with a 1/500 sec. shutter speed.

•Guide number for auto FP high-speed sync varies depending on the camera’s shutter speed. For example, when the shutter speed is changed from 1/500 sec. to 1/1000 sec., the guide number decreases 1 step. The higher the shutter speed, the smaller the guide number.

H

H-19