Instruction manual

Instruction Manual Roundshot D3 - version 4.05 – May 2013 - © by Seitz Phototechnik AG / Switzerland www.roundshot.ch page 27
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.