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High-Speed Sync Guide Number
*With the wide-angle panel attached
ISO
Shutter
speed
Camera format
Zoom position
35mm 85mm 70mm 50mm 35mm 28mm 24mm *20mm
DIGITAL 58mm 48mm 34mm 24mm 19mm 16mm *13mm
645D 106mm 87mm 62mm 43mm 35mm 30mm *25mm
ISO100
250 24.2 22.4 20.1 17.5 15.7 14.3 9.4
500 18.8 17.4 15.6 13.6 12.2 11.1 7.3
1000 14 13 11.7 10.1 9.1 8.3 5.5
2000 10.2 9.5 8.5 7.4 6.6 6 4
4000 7.3 6.8 6.1 5.3 4.8 4.3 2.9
6000 6.2 5.7 5.2 4.5 4.0 3.7 2.4
ISO200
250 34.2 31.6 28.5 24.7 22.2 20.3 13.3
500 26.5 24.6 22.1 19.2 17.2 15.7 10.3
1000 19.8 18.4 16.5 14.3 12.8 11.7 7.7
2000 14.4 13.4 12.0 10.4 9.4 8.6 5.6
4000 10.4 9.6 8.6 7.5 6.7 6.1 4.0
6000 8.8 8.1 7.3 6.3 5.7 5.2 3.4
ISO400
250 48.4 44.8 40.2 35 31.4 28.6 18.8
500 37.6 34.8 31.2 27.2 24.4 22.2 14.6
1000 28 26 23.4 20.2 18.2 16.6 11
2000 20.4 19 17 14.8 13.2 12 8
4000 14.6 13.6 12.2 10.6 9.6 8.6 5.8
6000 12.4 11.5 10.3 8.9 8.0 7.3 4.8