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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 16.0 14.7 13.4 11.1 9.8 9.4 6.2
500 12.7 11.6 10.6 8.8 7.7 7.4 4.9
1000 9.5 8.7 7.9 6.6 5.8 5.5 3.7
2000 6.9 6.4 5.8 4.8 4.2 4.1 2.7
4000 5.1 4.7 4.2 3.5 3.1 3.0 2.0
6000 4.3 3.9 3.6 3.0 2.6 2.5 1.7
ISO200
250 22.6 20.8 19.0 15.7 13.9 13.3 8.8
500 18.0 16.4 15.0 12.4 10.9 10.5 6.9
1000 13.4 12.3 11.2 9.3 8.2 7.8 5.2
2000 9.8 9.1 8.2 6.8 5.9 5.8 3.8
4000 7.2 6.6 5.9 4.9 4.4 4.2 2.8
6000 6.1 5.5 5.1 4.2 3.7 3.5 2.4
ISO400
250 32.0 29.4 26.8 22.2 19.6 18.8 12.4
500 25.4 23.2 21.2 17.6 15.4 14.8 9.8
1000 19.0 17.4 15.8 13.2 11.6 11.0 7.4
2000 13.8 12.8 11.6 9.6 8.4 8.2 5.4
4000 10.2 9.4 8.4 7.0 6.2 6.0 4.0
6000 8.6 7.8 7.2 6.0 5.2 5.0 3.4