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ë Speed is not the most important factor in camera equalization, consistency is. If a
slow camera has extremely consistent lag times it will be a better equalization
candidate than a faster but inconsistent camera. The reason why it is important to
know the approximate fastest lag time for a camera, especially an inconsistent one, is
to calculate margin of error (discussed later in this section).
The amount of drift or lag time inconsistency determines the highest shutter speed at
which a camera will reliably equalize. The following table should be used as a starting
point for testing purposes only. The numbers in this table are based on a 1/1000th or
faster flash duration.
Shutter Speed Probable maximum safe
lag time variation for
average focal plane
(35mm) camera
Probable maximum safe
lag time variation for
average leaf shutter
camera, F:8.0
1/300 <=0.0003 <=0.0013
1/250 <=0.0010 <=0.0020
1/200 <=0.0020 <=0.0030
1/180 <=0.0025 <=0.0035
1/125 <=0.0050 <=0.0060
1/90 <=0.0080 <=0.0090
1/60 <=0.0137 <=0.0147
1/30 <=0.0303 <=0.0313
1/15 <=0.0637 <=0.0647
1/8 <=0.1220 <=0.1230
1/4 <=0.2470 <=0.2480
1/2 <=0.4970 <=0.4980
1 <=0.9970 <=0.9980
2 <=1.9970 <=1.9980
N Leaf shutters have different shutter blade travel times depending on aperture. A
wider aperture takes longer and reduces the amount of variance allowed. A smaller
aperture takes less time thereby increasing the allowable variance. (A leaf shutter set
to F:4.0, for example, may reduce the variance to the same as a focal plane camera).