The Scan Time readout displays the overall scan time for the selected Scan Area, Resolution, and Line Time settings. The overall scan time is simply the (actual) time per line multiplied by the number of lines in the scan.
Remember that moving your light in half the distance from the lamp to the subject will increase your light level by two EV (2
See Appendix B for more information and options on controlling exposure and the subsequent density of your imaging.
Starting with the USB controller and SCSI controller firmware revision 4.14 (and later), there are line times faster than the maximum physical scan speed. When these speeds are selected, the insert will move from scan line to scan line at the fastest mechanical speed but will electronically capture a line of pixels at the higher speed. The maximum electronic shutter speed is 1/3000 second.
The higher capture speeds allow you to use larger apertures without burning out the image highlights or to allow use of the optimally sharp aperture for your lens without overexpos- ing the image.
ISO
This set of up/down buttons determines the overall sensitivity (ISO/ASA) of the camera. The ISO settings are ideal to use as fine tuning controls for expo- sure to accurately adjust to the desired image density. The ISO is continuously selectable in 1/10 EV steps from 200 to 3200 ISO (model series 4000, 6000 and Super 6K™) and from 120 to 2000 ISO with the Super 8K™. Hold the Option
key down and click on the Increase or Decrease buttons to jump to the maximum or minimum ISO values. With film, the apparent image grain increases as the ISO value is increased. The digital camera behaves in a similar manner with the shadow noise increasing as the ISO is increased.
1/10 EV steps is the default setting in the Preferences. For those who wish larger step sizes, the ISO increment can be changed to 1/3 EV in the Preferences.
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