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The GA-4 system for 1.25" eyepieces (cannot be used for off-axis systems!) is the flexible alternative to cross-hair eyepieces. The reticule is adjustable in two directions and allows rapid adjustment of the guide star without having to move the telescope. Any normal eyepiece can become a tracking eyepiece; an extra reticule is not required. Lengths and angle markings on the reticule (the illumination is continuously adjustable) allow indirect tracking of comets and minor planets. A built-in 3X Barlow lens for increasing the focal length of the guide scope is included in delivery.
