Instruction manual

Instruction Manual Roundshot D3 - version 4.05 – May 2013 - © by Seitz Phototechnik AG / Switzerland www.roundshot.ch page 53
Why is the rotation point important for sharpness?
The Seitz D3 digital scan back uses a surface of the TDI sensor for simultaneous
exposure of pixels. The more TDI Stages are selected, the larger this surface becomes.
When the rotation point is not correctly set, two points in space do not have the same
alignment on the left or the right of the sensor surface. Since for one point in space a
number of pixels of the sensor are combined, the misalignment will lead to a blurred
image. For a good rotation point, all pixels are aligned and the image is sharp.
Good rotation point: Bad rotation point:
When using less TDI Stages (for example: 1x), the loss in sharpness resulting from
of a bad rotation is much less than when using more TDI Stages (for example: 20x).
Rotation
point
Set the exact rotation point (b-value) on the optical bench
When confirming the lens data or distance setting the software
indicates the new rotation point (b-value) as follows (example):
Please refer to previous section 4.1 to see how to set the correct b-value on the
camera. Small deviations can make a noticeable difference in sharpness.
4.2 … obtain the best sharpness (continued)