It is a general instrument and can obtain target
image at infinity. It can be used to check resolution,
parallax, diopter of telescopic system. It can also be used
to check parallelism of optical axis of binoculars with
checking reference line not more than 100mm.
Details：
Specification of the instrument:
Focal length of collimator: 999.21mm
Useful aperture of objective lens: Ø 116mm
Center height of collimator: 300mm
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