The optical axis runs concentrically with respect to the tubular barrel to a very high degree of accuracy. The mounting of the alignment telescope is accurately tied to its optical axis. It is specifically designed for aligning boreholes, bearings, optical setups etc.
The alignment telescope has a wide range of focus from a few inches to infinity. The sturdy, stainless steel construction will maintain specifications even in rough working conditions.
Optional autocollimation using the alignment telescope is accomplished by specifying an autocollimation eyepiece in place of the standard eyepiece.