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Versatile 60mm aperture Guide Scope with a built-in helical focuser for precise focusing of potential guide stars; will help guide you to capturing higher quality astrophotos;an ideal addition to any astrophotographers collection of gear The helical focuser simply moves the attached device inwards or outwards while maintaining its orientation;this convenient feature means your field of potential guide stars will not rotate as focus is adjusted further increasing ease of use For those nights when you don’t plan to capture astrophotos exposures this versatile Guide Scope can double as a straight-through finder scope with an optional 1.25″ eyepiece installed;For example inserting a 25 mm eyepiece creates a 9.6×60 finder scope or you can insert one Illuminated Centering Eyepieces for use as a finder with illuminated crosshairs for easy aiming The focuser boasts 8 mm of precise helical focus travel;plus telescoping drawtube housing provides up to 35mm of additional back-travel if needed for your particular autoguider device;No extension tubes necessary; a compression ring fitting keeps any inserted autoguider cameras or eyepieces free of pesky scratches The Multi-Use Guide Scope with Helical Focuser also features male T-threads on the focuser collar for secure threaded attachment of guide cameras equipped with female T-threads You can use this handy scope as a deluxe straight-through 60mm finder by inserting an optional 1.25″ eyepiece sold separately. A practical benefit of this is that prior to guiding br you can insert an eyepiece into the guide scope and easily align the guide scope with your main imaging telescope. Then remove the eyepiece and attach your autoguider camera p This complete guide scope comes with two heavy-duty guide scope rings and a 3.5″ long 1.18″wide dovetail mounting bar which is compatible with dovetail finder scope bases for easy attachment. br The dovetail bar features five threaded through-sockets for versatile attachment options. The included guide scope rings feature six metal thumbscrews for precise aiming p Specification: /b br Type of Telescope: Achromatic Refractor br Lens: Cemented br Tube material: Aluminum Alloy br Aperture: 60mm / 2.36in br Focal Length: 240mm /9.45in br Focal Ratio: F4 br Coating: Fully multi-coated br Best for imaging: Deep sky br User level: Intermediate br Rough Focusing Range: 35mm br Focuser: Helical Focuser with 8 mm Travel br Connection to eyepiece: 1.25inch br Tube diameter: 66mm br Dewcap diameter: 69mm br Total Length: 270mm br Included accessories: Tube Rings and Dovetail Rail p Package Includes: /b br 60mm Primary Mirror br Guiding Bracket w/ 89mm Dovetail Plate br 1.25inch Helical Focuser br 6PCS Metal Thumbscrews br br Notice: when you attach guide scope and metal and metal collide the focus barrel may be make a sound. But the sound is very small. /b br If the set screw is tight there is no flop. /b br