MaxTech Transceiver - Manual (Page 44)

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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).