45 ë – MaxTech Transceiver User Manual
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45
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Speed is not the most important factor in camera equalization, consistency is. If a
slow c amera h as extrem ely cons istent lag tim es it will be a better eq ualization
can didate than a faster but inc ons istent c amera. T he reas on wh y it is imp ortant to
know the ap proxim ate fas test lag tim e for a c am era, es pec ially an inc ons isten t one, is
to calculate margin of error (discus sed later in this section).
T he am ount of drift or lag tim e incon sis tenc y determ ines th e highes t sh utter s peed at
which a camera will reliably equalize. The following table should be used as a starting
point for testing purp oses only. Th e num bers in this table are bas ed on a 1/1 000 th or
fas ter flash duration .
Sh utter S peed
Probable maximum safe
lag time variation for
average focal plane
( 35 m m ) camera
Probable maximum safe
lag time variation for
average leaf shutter
cam era, 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 s hutters have diff erent s hutter b lade travel times d epend ing on ap erture. A
wider ap erture takes longer and reduc es th e amou nt of varianc e allowed. A s maller
apertur e takes les s tim e thereby inc reasing the allowable varianc e. (A leaf s hutter s et
to F:4.0, for example, may reduce the variance to the same as a focal plane camera).