"Fraunhofer compact guide to 50/162 mm (F / 3.2) with support, mounting bar dovetail adjustable, universal mounting plate, ring parafocality 1.25" "ť and hex wrench. Allows you to frame numerous potential guide stars through a perspective bright and wide field. The bar dovetail adjustable makes installation easy and fast on every astrograph. The weight of the tube (450 gr) does not weigh down the set -up astrofotografico in which it is added. Designed to be used with astrographs with a focal length of at least 1500 mm. "