Line Time
These up/down pushbuttons select the integration time for each line in a
scan, and are the digital equivalent of the shutter time. As with film, the primary controls for determining exposure are the lens aperture and the line time (shutter
time) along with the amount of light (which is also controllable to some extent in Line Time control. many studio setups).
The line time is adjustable in 1/3 EV
Hold the Option key down and click on the Increase or Decrease buttons to jump to the maximum or minimum line time values.
The Line Time readout displays the selected time per line, in traditional photographic increments. The actual integration time used by the system for each line time varies slightly according to the Line Sync mode selected in Preferences. The Line Sync mode chooses among line times that are exactly as displayed (Exact mode), or line times that are multiples of the local AC power line
By using line times that are precise multiples of the AC power
Longer line times become increasingly effective at rejecting these intensity variations. Not all line times will sync to the AC line frequency, and the shortest line times are too fast to use with sources having significant flicker, as it may be possible in some cases to expose an entire line between the bursts of light from certain sources (while there is little or no light). Low wattage tungsten lights or fluorescent lamps with magnetic ballasts are the biggest offenders.
Line times that cannot be synchronized to the selected AC main frequency will be dis- played in RED. Use these red settings with caution!
These line times may still be perfectly usable with sources that don’t produce appreciable flicker. Line times that are synchronous to the chosen AC main frequency are displayed in BLACK, as are all line times when Exact Line Sync is chosen. See Appendix C for more information about Line Times and Preferences for details on choosing the appropriate Line Sync setting (60 Hz is the default set- ting).
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