Your manual for riflescopes ZF 4 and 6, but the important points only:
Adjusting the visual acuity
The telescopic sight’s visual acuity is adjusted by turning the knurled
button on the ocular side. The knurled button can be set to - 3 dioptres by
anti-clockwise turning. This setting is for short-sighted persons. Turning
the button to + 2 dioptres adjusts the telescopic sight for far-sighted
persons.
The maximum values are attained by turning the button by 90 °. Integration
of a limit stop was dispensed with to avoid damage caused by overwinding.
The adjustment for persons with normal vision is made by turning the knurled
button until the white dot on the knurled button is aligned with the index
line on the main tube.
Persons with defective vision are advised to wear their normal spectacles.
Scope sight adjustment
The scope sight height can be adjusted by turning the knurled button on the
lens side. A permanent fixation is carried out after zeroing in.
A +- 90 ° rotation corresponds to a height movement of 67 cm on a target
that is 100 m away. The maximum adjustment range of 134 cm is passed through
with the rotational range of 180°. To prevent forcible damage, no limit stop
is provided for.
Range estimation
The free space between the scope sight’s cross bars corresponds to a width
of 70 cm at a 100 m distance from target. The diameter of cross bar and post
reticule is specified such that a 20 cm wide strip is covered on a target
that is 100 m away. In this way, the scope sight serves as range estimation
aid.
I hope I could help you.
Best regards,
Bernd Fischer