Hutech Astronomical Products Equipment for the Serious Amateur Astronomer
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Features: 125mm to 155mm long (30mm focus travel) M75 male/female (reversible) Finest pitch among BORG helical focuser family -- 1mm focus travel for 15mm (18°) of rotation of the focusing tube (OD 98mm) Part #7875 M75 Helical focuser 2018-01-03