Star astigmatizing lens
The star astigmatizing glass expands the point-shaped star into a horizontal light bar. In addition, an inclination of the sextant is immediately visible.
The glass can be attached to the sextants as the 5th glass in index direction and can be used with all horizon mirrors.
It can also be retrofitted by the user to all Cassens & Plath sextants.
1) Seen through a full-view mirror
2) Seen through a split-view mirror3&4) Tilting of the sextant