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Brand Name Rating # of Ratings
William Optics William Optics 2" 99% Dielectric Dura Bright Carbon Fiber Mirror Diagonal for SCTs 4.9 20
William Optics William Optics 2" 99% Dielectric Dura Bright Carbon Fiber Mirror Diagonal for Refractors 4.9 20
William Optics William Optics 1.25" Binoviewer Package (with 1.25" Wide Angle Eyepieces and 1.6x Barlow) 4.6 19
William Optics William Optics 2" to 1.25" RotoLock Eyepiece Adapter # F-ROTO-A2-125 4.7 18
William Optics William Optics 1.25" Carbon Fiber Dielectric Star Mirror Diagonal 4.6 17
William Optics William Optics SCT Thread Adapter for 2" Diagonal 4.9 16
Celestial Teapot Designs Messier Observer's Planisphere - Large 18" Star / Constellation Finder 4.9 13
William Optics William Optics 2" Carbon Fiber Dielectric Star Mirror Diagonal with SCT Adapter 4.7 13
William Optics William Optics 2" Carbon Fiber Dielectric Star Mirror Diagonal for Refractors 4.7 13
William Optics William Optics 1.25" 45-deg Erecting Prism Diagonal 4.9 11
William Optics William Optics Red Dot Finder with Quick Release Bracket # M-RDF-P 4.6 10
William Optics William Optics 2" Swan Series Eyepiece - 40mm 4.6 10
William Optics William Optics 2" 90-deg Erecting Prism Diagonal 4.8 8
William Optics William Optics 1.25" 99% Dielectric Dura Bright Carbon Fiber Star Mirror Diagonal 5.0 8
William Optics William Optics 1.25" 90-deg Erecting Prism Diagonal with Helical Focusing # D-EP90-125 4.5 8
Howie Glatter Howie Glatter Parallizer - 2" to 1.25" Eyepiece Adapter 5.0 8
Howie Glatter Howie Glatter Holographic Attachment for Laser Collimator - Concentric Circle Pattern 5.0 8
Howie Glatter Howie Glatter 650nm Standard Brightness Red Laser Collimator - 2" 4.7 7
Howie Glatter Howie Glatter 650nm Standard Brightness Red Laser Collimator - 1.25" & 2" 4.7 7
Howie Glatter Howie Glatter 650nm Standard Brightness Red Laser Collimator - 1.25" 4.7 7
William Optics William Optics 2" 99% Dura Bright RotoLock Mirror Diagonal for Refractors # D-DIG2D-ROTO-A2 5.0 6
William Optics William Optics Mounting Rings (Set of 2) - 90mm (3.54") 4.8 6
William Optics William Optics 2" Swan Series Eyepiece - 25mm 4.5 6
William Optics William Optics 2" RotoLock Eyepiece Adapter / Visual Back with 2" SCT Female Thread # D-ROTO-A2-SCT2F 4.7 6
William Optics William Optics 2" DDG Crayford Focuser for Synta Refractors - Dual Speed 5.0 6
William Optics William Optics 2" 45-deg Erecting Prism Diagonal # D-EP2 4.5 6
Howie Glatter Howie Glatter TuBlug - Barlowed Collimation Plug for Newtonian Telescopes - 2" 5.0 6
Howie Glatter Howie Glatter TuBlug - Barlowed Collimation Plug for Newtonian Telescopes - 1.25" 5.0 6
Howie Glatter Howie Glatter 635nm High Brightness Red Laser Collimator - 2" 5.0 6
Howie Glatter Howie Glatter 635nm High Brightness Red Laser Collimator - 1.25" & 2" 5.0 6
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