Time Conversion Charts
Frac tions to D ecim al:
Here are some comm on photographic fractions in decimal values. All numbers are rounded to the nearest .0001 or 1/10,000th.
LThes e times are not R ear Curtain S ync tim es. T hes e are prec ision num bers . Rear Curtain Sync numbers are always less than the exact conversions. Refer to the
Re ar C urtain section, Page 33, for more information.
Fraction | Decimal | Fraction | Decimal |
½ | 0.5 seconds | 1/180 | 0.0056 seconds |
1/4 | 0.25 seconds | 1/200 | 0.005 seconds |
1/8 | 0.125 seconds | 1/250 | 0.004 seconds |
1/15 | 0.0667 seconds | 1/500 | 0.002 seconds |
1/30 | 0.0333 seconds | 1/1000 | 0.001 seconds |
1/60 | 0.0167 seconds | 1/2000 | 0.0005 seconds |
1/90 | 0.0111 seconds | 1/4000 | 0.0003 seconds |
1/125 | 0.008 seconds | 1/8000 | 0.0001 seconds |
Seconds to Minutes and Hours:
Use the following table to help calculate long intervals or delays.
Seconds | M inutes | Seconds | Hours |
60 seconds | 1 m inute | 3600 seconds | 1 hour |
120 seconds | 2 m inutes | 7200 seconds | 2 hours |
180 seconds | 3 m inutes | 10800 seconds | 3 hours |
240 seconds | 4 m inutes | 14400 seconds | 4 hours |
300 seconds | 5 m inutes | 18000 seconds | 5 hours |
600 seconds | 10 m inutes | 36000 seconds | 10 hours |
1200 seconds | 20 m inutes |
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1800 seconds | 30 m inutes |
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