Instruction manual

Instruction Manual Roundshot D3 - version 4.05 – May 2013 - © by Seitz Phototechnik AG / Switzerland www.roundshot.ch page 40
3.2.3 Lens
The rotation point of the lens defines the position of the camera head for which the best
sharpness is achieved. The optical bench of the camera allows sliding the camera head
forward or backward to place it in its optimum rotation point. You will find more
background information on how to obtain optimum sharpness through rotation point
settings in section 4 „How to“.
In case the lens is not yet on the lens list it is also possible to program a new lens.
To do this the following parameters are required:
h = b - f
where: h = h-value
b = b-value (at infinity)
f = effective focal length (at infinity)
There are two ways to determine the optimum rotation point:
• By calculation (from technical data sheet) – done at factory
• Through empirical testing
For more information on the empirical testing see section 4 „How to“.
The b-value is the position (in mm) on the optical bench (optimum rotation point).
The h-value is used for calculation purposes only and does not have any
significance on its own.
A large variety of lenses are calibrated at the factory, i.e. their rotation points (b-value) are
determined for optimum sharpness. These lenses are included in the factory lens list.