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Guide no. (at iso 100 in meters – Canon 550EX User Manual

Page 121

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Specifications

• Guide No. (At ISO 100 in meters

[Normal Mode]

Flash Coverage (mm)

17

24

28

35

50

70

80

105

Normal (full) Flash Guide No

15

28

30

36

42

46

50

55

Quick Flash

Same as for manual flash from 1/2 to 1/6.

Manual Flash Guide No.

1/1

15

28

30

36

42

46

50

55

1/2

10.6

19.8

21 2

25.5

29.7

32 5

35 4

38 9

1/4

7.5

14

15

18

21

23

25

27 5

1/8

5 3

9.9

10,6

12,7

14.8

163

17.7

19.5

1/16

38

7

7.5

9

10.5

11.5

12.5

13.8

1/32

27

49

5 3

6.4

7,4

8 1

8.8

97

1/64

1.9

35

3.8

4.5

5,3

58

6.3

6.9

1/128

1 4

2 5

2 7

3.2

3.7

4.1

4.4

49

[High-Speed Sync (FP Flash) ]

Shutter Speed

Flash Coveraae (mm)

17

24

28

35

50

70

80

105

1/125

106

19.8

21.2

252

29.7

32.5

35 4

38.9

1/160

9.4

175

18,8

22.5

26.3

28 8

31.3

34.4

1/180

8.8

16.5

17.7

21,2

24.7

27.1

29 5

32,4

1/250

7.5

140

15.0

180

21.0

23.0

25.0

27.5

1/320

6.6

12.4

13.3

15,9

18.6

20.3

22.1

24.3

1/350

6,3

11 8

12.7

15.2

177

194

21.1

23.2

1/400

5.9

11.1

11.9

14.2

16.6

18.2

19.8

21 7

1/500

5 3

99

10.6

12,7

14.8

16.3

177

194

1/640

4,7

8.8

9.4

11.3

13.1

14-4

15.6

17.2

1/750

4.3

8.1

8.7

10.4

12.1

13.3

14.4

15.9

1/800

4.2

7.8

8.4

10.1

11.7

12.9

14,0

15.4

1/1000

3.8

7.0

7.5

9.0

10.5

11.5

125

13.8

1/1250

3.4

6.3

6.7

8.0

9.4

103

11.2

12.3

1/1500

3 1

5.7

6.1

7.3

8.6

94

102

11,2

1/1600

3.0

5,5

5.9

7.1

8.3

9.1

9.9

10.9

1/2000

2.7

4.9

5,3

64

7.4

8.1

8.8

9.7

1/2500

2.4

4.4

4.7

5.7

6.6

7.3

79

8.7

1/3000

22

40

4.3

5.2

6.1

6.6

7.2

7.9

1/3200

2.1

3.9

4.2

5.0

5.9

64

7.0

7.7

1/4000

1.9

3.5

3.8

4.5

5.3

5.8

6.3

6.9

1/5000

1.7

3.1

3.4

4.0

4.7

5.1

56

6.1

1/6000

1.5

2.9

3.1

37

4.3

4,7

5.1

5.6

1/6400

1.5

2.8

3.0

3.6

4,2

4.5

49

5.4

1/8000

1.3

2.5

2.7

3.2

3.7

4 1

44

4.9

(Multiply by 3,3 to convert to feet)

121