![]() ![]() Minimum focuser height (without 1.25" adapter) = 3.05" (77.5mm).Also included is a 2"-1.25" adapter with brass compression rings and threads to accept standard 2" filters. The 2" focuser barrel features a brass compression ring. Every part is carefully selected and designed to deliver a linear focusing system that will provide both beauty and quality for years to come. The highly polished, anodized black aluminum is complemented by the meticulous CNC machining. Very High Quality Construction and Features The drawtube features a laser-etched measurement scale for quick and repeatable focusing. The focusing tension can be controlled by another large screw on the underside of the focuser. For critical imaging applications, the focuser position can be locked in place via the large thumbscrew provided for this purpose on the top of the focuser. You'll feel as if the focuser is gliding on air as you meticulously seek the perfect focus. The ultra-smooth focuser adjustment knob is only topped by the 10:1 fine adjustment knob which yields superior fine-tuning that will stay in place without slippage for hours on end. ![]() This linear bearing rail mechanism also allows the use of heavier loads (GSO's rated load capacity for their linear bearing focusers is about 9 lbs (4.1 kgs)). The result is zero flexure throughout the focus travel range, even in the worst case scenario when the focuser is parallel to the ground and carrying a heavy load such as a large CCD camera. The new linear bearing focuser is built with a cutting-edge rail system made of stainless steel which provides extended, consistent, and linear contact with the focusing mechanism and the inside of the focuser body, even when the focuser is fully extended. Because of the small area of contact between the focuser tube and these bearings, changes in load or telescope orientation can cause some amount of slop in the focuser drawtube. In conventional Crayford focusers, the drawtube is held in place by four roller bearings. The linear stability and repeatable quality of focus reached with this focuser will have you returning night after night for more spectacular views, sharper images, and consistent enjoyment! It is designed specifically to meet the heavier equipment and stability requirements of astrophotography equipment and heavy eyepieces. This GSO Dual-Speed Linear Focuser for Newtonian reflector telescopes features the most recent innovation in focuser design to hit the astronomy market in recent years. ![]()
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