Technical note:
When focusing at closer distances than infinity, the effective focal length
increases, which is (after entering the correct distance) automatically
adjusted by the software. Also, the software adjusts the horizontal image
format, as with a larger effective focal length the image becomes longer
(more pixels).
3.1.1 Shoot settings (continued)
Exposure: select the image exposure mode. Several automatic modes are available
in addition to fixed exposure speeds:
• Automatic (spot): the sensor reads the light at the current position (or at a defined
measure angle). This “spot” reading is used for the entire scan.
• Automatic (prescan): the camera first completes a prescan to measure the actual
light conditions for the chosen image angle and applies the resulting average
exposure for the final (second) scan
• Automatic (variation): the camera adjust the rotation speed for every scan line.
With the parameter 1 to 100 the degree of speed adjustment can be set (1 for weak,
100 for maximum adjustment)
• Automatic (variation with prescan): the camera will create a prescan for light
measuring and then a second scan for exposure. During the second scan the
camera adjusts the rotation speed for every scan line. With the parameter 1 to 100
the degree of speed adjustment can be set (1 for weak, 100 for maximum
adjustment)
To freeze motion, use a fast exposure speed. This is achieved by using a
smaller area of the sensor, for example TDI 5x or 10x (minimum exposure
speed 1/400 and 1/200 sec). The fastest exposure speed is reached with
TDI 1x (1/2‘000 sec).
Depending on the available light, setting a higher ISO/ASA value or
opening of the aperture may be required (for example, from f=16 to f=8).
When working with automatic exposure we recommend using the
prescan option as this allows the most accurate exposure control.
Instruction Manual Seitz 6x17 Digital - version 4.05 - May 2013- © by Seitz Phototechnik AG / Switzerland www.roundshot.ch page 25
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