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Guide number table, Specifications, Tips on speedlight care and reference information – Nikon SB-500 AF Speedlight User Manual

Page 86: Guide number table (for auto fp high-speed sync)

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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

level

1/1

1/2

1/4

1/8

1/16

1/32

1/64

1/128

Guide number

24/

78.7

16.9/

55.4

12/

39.3

8.4/

27.5

6/

19.6

4.2/

13.7

3/

9.8

2.1/

6.8

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

ISO 100; m/ft

Flash output

level

1/1

1/2

1/4

1/8

1/16

1/32

1/64

1/128

Guide number

10.1/

33.1

7.1/

23.2

5.1/

16.7

3.6/

11.8

2.5/

8.2

1.8/

5.9

1.3/

4.2

0.9/

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.