SineImage YE0246 4 Quadrant Sector Star Chart
| Material | Film or HD photographic paper |
The special star consists of four segments each with a different number of cycles. So it is possible to focus the wide angle and the tele position for an optimal adjustment of the focusing point. This is essential for positioning the flange focal distance without a special collimator.
Furthermore the Siemens star can be part of the scene so that the sharpness can be focussed definitely to a fixed point.
