Explore Scientific ED 152mm Carbon Fiber Edition f/8 Air-Spaced Apochromatic Triplet Refractor Telescope. The 152mm is an Explore Scientific Air-Spaced Apochromatic Triplet Refractor with true APO optics. The optics are diffraction limited at .25PV or better and use Genuine ED glass from Hoya Japan is respected for its quality. Enhanced Multi-Layer Coatings (EMD) are deposited on optical elements to boost contrast and eliminate light scatter. Contrast is further enhanced with the installation of matte black knife-edge baffles in the optical tube assembly. While refractors seldom require additional collimation after initial factory adjustment the lens cell design allows for consumer collimation. Sending your Explore ED152 Refractor w/APO Optics off to the factory is always an option but is not required. The Explore Scientific 152mm Model Apochromatic Optic comes with a special edition 3" rack & pinion dual-speed focuser made for Explore Scientific by Starlight Instruments. A 2" compression ring adapter is included. Included 2" diagonal has a precision-polished mirror with enhanced 99percent dielectric coatings. A 1.25" compression ring adapter is part of this package. The 152mm telescope is supplied with a Losmandy style dovetail for attachment to mounts from Celestron Losmandy Meade and more. Explore Scientific ED 152 Carbon Fiber Edition f/8 Air Spaced Triplet; Feathertouch Two-Speed 3" Focuser; Cradle Ring with Handle and Losmandy Style Dovetail Plate. Each Explore Scientific 152mm Refractor is serial numbered and if registered within 60 days is protected with the Explore STAR Lifetime Transferable Warranty. Specifications for Explore Scientific 152mm Carbon Fiber Apochromatic Refractor: Focal Length: 1216mm Focal Ratio: f/8 Limiting Magnitude: 13 Resolution: .75 arcsec Tube Length w/ Dew Shield: 52"; 1320mm Tube Length w/out Dew Shield: 41"; 1041mm Diameter: 165mm Weight: 20.5lb; 9.3kg Package Contents: Explore Scientific ED 152mm Carbon Fiber Edition f/8 Air-Spaced Apochromatic Triplet Refractor Telescope Explore Scientific TED15208CF-HEX33: ED 152mm Carbon Fiber Edition f/8 Air-Spaced Apochromatic Triplet Refractor Telescope