Top 20 Best Selling Diagonals Telescope Accessories (2019)




Our highest-quality mirror diagonals feature sophisticated, lab-tested dielectric coatings that boast an astounding 99% reflectivity. Dielectric coatings are more durable than enhanced aluminum coatings, so you'll enjoy years of exceptional performance. T ... more info

Introducing our new 2 XLT Diagonal. This high quality multi-coated mirror diagonal allows you to take advantage of the wider field of view provided by 2 eyepieces. Featuring our premier StarBright XLT coatings, this unit has an interferometer tested 10th ... more info


Introducing the New William Optics 2014 Dura-Bright diagonal - a dramatic step forward in the evolution of mirror diagonals! This 90° 2 mirror diagonal has a Dura-Bright 12mm thick mirror, 1/10 or better wave surface accuracy, and dielectric mirror coatin ... more info


Introducing the New William Optics 2014 Dura-Bright diagonal - a dramatic step forward in the evolution of mirror diagonals! This 90° 2mirror-type star diagonal has a Dura-Bright 12mm thick mirror, 1/10 or better wave surface accuracy, and dielectric mirr ... more info



New from William Optics - 1.25 90-deg Erecting Prism Diagonal with Helical Focusing # M-P90. For use only with William Optics' 50mm CCD guidescope to convert guidescope into a right angle correct image finderscope. Diagonal features a helical focusing mec ... more info

William Optics 2 45-deg Erecting Prism Diagonal D-EP2 ... more info



This Astro Optics 1.25 erect image diagonal uses an Amici prism design. This design allows you to look into the telescope at a 45° angle, at images that are oriented properly, meaning the image is upright and correct from left to right. Housing is made of ... more info

This precision 90-deg star diagonal feature fully coated prisms, delivering superior image fidelity. Features a machined aluminum eyepiece holder and a chrome-plated metal barrel that's threaded for filters. The eyepiece holder has a setscrew for locking ... more info



Our highest-quality mirror diagonals feature sophisticated, lab-tested dielectric coatings that boast an astounding 99% reflectivity. Dielectric coatings are more durable than enhanced aluminum coatings, so you'll enjoy years of exceptional performance. T ... more info


BROTHER INTERNATIONAL CORPORAT P-TOUCH TZE241 TZE STANDARD ADHESIVE LAMINATED LABELING TAPE P-TOUCH TZE241 TZE STANDARD ADHESIVE LAMINATED LABELING TAPE Manufacturer : BROTHER INTERNATIONAL CORPORAT UPC : 012502625742 ... more info


This Astro Optics 90° hybrid star diagonal gives you greater versatility. A hybrid diagonal allows you to use 1.25 eyepieces on a telescope with a .965 focuser. Works with any refractor that has a .965 focuser and older (American made) Celestron C90 spot ... more info

Features: 1. Designed for anti-tracking 2. Breaking all the rules of tracking 3. No need to turn around to see who is following you 4. Side mirror view on both sides design, just works like the rearview mirror in your car 5. Protection against ultraviole ... more info




Don't put a standard-issue diagonal into a high-quality refractor or Cassegrain telescope or you'll be losing 10% or more of the light collected by the scope's optics. Use an Orion Enhanced diagonal instead. Their lab-tested enhanced aluminum coatings ref ... more info

Enhanced dielectric coatings with 99% Reflectivity. Slip fit 2-Inch Diagonal with 1.25-Inch adapter. For all LX models. Use 07085 SC thread to 2-Inch Accessory Adapter for LX90s and other SC thread screw-on only systems. Boost eyepiece performance with th ... more info


Stellarvue Deluxe 1.25 Dielectric Diagonal ... more info


William Optics 1.25 Carbon Fiber Dielectric Star Mirror Diagonal for Refractors D-125D ... more info



William Optics 2 Carbon Fiber Dielectric Star Mirror Diagonal for Refractors with 1.25 Adapter D-DIG2D-C ... more info

The William Optics 1.25 Dielectric Diagonal is a beautiful aftermarket diagonal that will help you achieve the highest achievable brightness, contrast, and sharpness of any 1.25 Dielectric Diagonal. William Optics 1.25 Dielectric Diagonal Features & Spec ... more info



A star diagonal lets you view objects that are at a 90° angle from the direction the telescope is pointing, thereby allowing comfortable viewing when the telescope is pointed at, or near, the zenith (i.e. directly overhead). The resulting image is right s ... more info

Baader Planetarium SCT Lockring for 2 Maxbright Diagonal LRING* The Baader SCT Lockring allows for enhanced flexibility in the placement of your Baader Maxbright Diagonal when affixed to your SCT Telescope. The set up of the Baader SCT Lock Ring is easy. ... more info

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