It seems that this Jason has"circular collimation error", also known as "lean". If one assumes perfect prisms, and one prism has not jumped out of its seat, then one or more of the prisms has rotated in its seat, in the plane of the entry and exit faces, probably because the brittle fixation glue is cracked .This is cured by rotating one prism with respect to its mate,in the plane of its entry and exit faces, not by rotating the prism shelf as a unit.
Compare the fits of this Jason with those in a WW II Bausch and Lomb U. S. N. Mk 28 7 x 50, of which there are many surviving. No glue. First class manufacture ensures long term durability, not brittle glue to fill the wide tolerance gaps.
Since you will likely use glue to fix this, choose one with resilience and integrity, not one which cures nearly instantaneously on the production line.
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Re: Colimate an old Jason Binoculars
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