Foif J2-2, Инструкция по эксплуатации

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Telescope:
The telescope gives an erect image. The objective is constituted by a cemented
doublet and a separate lens. The eyepiece consists of a pair of symmetrical lenses.
This kind of construction gives excellent performance in image formation, brightness
and definition.
There are two optical sights on the top and the bottom of the telescope respectively
so that they are used for the initial pointing to a target in face left as well as face
right observations, when using electrical illumination for night or underground work,
the light from the vertical circle plug-in lamp is then reflectod off a mirror inside the
telescope towards the reticle.
On the surface of the reticle is the protective glass, should it be contaiminated, it can
still be cleaned without any harm to the reticle. After a left turn of the bayonet ring,
the eyepiece can be removed for exchange with another eyepiece.
Standing Axis
The standing axis system is of semi-kinemic type. The top of the axis bush is
cone-shaped and carries a ball bearings, the axis stem fits into the bush and is
centered in the ball bearing by the weight of the alidade, so that the play has little
effect on the verticality of axis.