Astromania Upgraded Guide Tube 70mm with Double Spiral Focusing Finder, Deluxe Set, Compatible 1.25" Eyepiece for Astronomical Telescope and Automatic

400mm focal length: with bright; wide-field optics puts numerous potential guide stars in sight so you never have to search for one; mini guide tube for quick finding of objects and guide stars, both for visual and photographic use Have a built in auger focuser with brass compression ring and 2 thumb screws; 90mm focusing range "10mm focusing range with micro focusing spiral focuser; the rest is provided by a fixable, scaled pull tube" is made possible by extremely precise focus adjustment Take a 1.25 inch eyepiece; Worm extractor for fast focusing prevents camera or eyepiece from rotation; Use as a viewfinder to waste less time finding objects in visual observation; Come with matching tube clamps and synta mounting plate for easy installation Sturdy black anodized aluminum housing; Machined and knurled ring allow precise focus adjustments; Thumb screw to fix the extension tube; Other two holes are equipped with built in hex screws that tighten two hex bolts with hex key for locking Adjustable dovany weight for an astrophotography setup and can be conveniently stored in an accessory case between uses. Dovetail guide mount installs quickly and easily to virtually any astrophotography telescope