Instruction manual

Instruction Manual Roundshot D3 - version 4.05 – May 2013 - © by Seitz Phototechnik AG / Switzerland www.roundshot.ch page 39
3.2.3 Lens
Name: defines the name of the lens. Both the lens list and the favourite lens list will be
updated with the new name when clicking outside the field
Effective focal length: defines the effective focal length at infinity as given in the
technical data sheet of the lens manufacturer. Defining the correct effective focal
length at infinity is very important for optimum sharpness (see also chapter 4.1.1. „How
to obtain optimum sharpness“).
H: the h-value is used for calculation purposes only and does not have any significance
on its own. It defines the ideal position of the camera head on the optical bench. See
next page for detailed explanation
B: the b-value is the position (in mm) on the optical bench (optimum rotation point). It
is linked to the h-value and the effective focal length. See next page for a detailed
explanation
Image circle: defines the image circle delivered by the lens. For lenses with an image
circle of less than 60mm (for example small format lenses), the image format (vertical
resolution in mm) will be automatically adjusted. This avoids black borders on the
upper and lower end of the image circle. See also chapter 3.1.2 „Format“.
Max. shift distance: defines the maximum shift allowed with lenses with an image
circle bigger than 60mm. The maximum shift value in one shift direction is indicated in
the „shoot“ menu bar.
Calibrated lens: Some fisheye lenses can be used to create fully spherical panoramas.
To get perfect results it is necessary to calibrate these lenses at the factory. In this case
this option will be checked by default (for example the “Mamiya 24mm Sekor C
calibrated” lens)
Every lens is defined by a set of parameters described below:
Set all lens parameters with the highest possible precision as they can
have a major effect on image quality. Wrong parameters may lead to
blurred images, stretched or compressed objects.