Sky Rover Optics 90 mm F/6 GPS Telescope (Sky Rover Optics, SKU: 98633) is a compact apochromatic refractor designed for visual observing and astrophotography. The 90 mm aperture, 540 mm focal-length objective has an air-spaced triplet design containing one Super ED glass element. The f/6 focal ratio provides a wide field of view, while the 3.3" dual-speed R&P focuser, CAA mechanism and multiple threaded interfaces facilitate the configuration of advanced imaging systems.

Key features

• 90 mm aperture, 540 mm focal length and f/6 focal ratio
• air-spaced apochromatic triplet containing a Super ED glass element
• fully multi-coated FMC optics
• 3.3" dual-speed rack-and-pinion focuser with 85 mm of travel
• internally blackened and baffled focuser drawtube reducing stray light
• M83 × 1 and M63 × 1 threads and a standard 2" eyepiece interface
• twist-lock adapter allowing the use of 1.25" eyepieces and accessories
• included CAA mechanism allowing the attached camera or visual equipment to be rotated
• aluminium optical tube with an internal baffle system suppressing stray light
• retractable dew shield and compact transport length of approximately 355 mm
• CNC tube rings, narrow dovetail plate and carrying handle with additional accessory mounting points
• mounting holes designed for the installation of an electronic focuser bracket
• compatibility with an optional 1× field flattener and a dedicated 0.8× reducer changing the focal ratio to f/4.8

Set contents

• Sky Rover Optics 90 mm F/6 GPS telescope OTA with 3.3" focuser
• CAA mechanism
• extension tube
• 2" eyepiece holder
• 2" to 1.25" twist-lock adapter
• set of CNC tube rings
• narrow dovetail plate
• Vixen-compatible carrying handle
• objective cover
• soft transport bag

Technical specifications

• manufacturer: Sky Rover Optics
• model: SKY ROVER 90GPS Telescope
• SKU: 98633
• type: apochromatic refractor OTA
• intended use: visual observing and astrophotography
• objective diameter: 90 mm
• focal length: 540 mm
• focal ratio: f/6
• objective design: air-spaced apochromatic triplet
• special glass: one Super ED element
• Abbe number of the Super ED glass: at least 95 according to the manufacturer
• optical coatings: FMC
• optical-tube material: aluminium alloy
• optical-tube design: internal baffle system suppressing stray light
• optical-tube diameter: 105 mm
• dew-shield diameter: 121 mm
• dew-shield type: retractable
• focuser type: dual-speed rack-and-pinion
• focuser diameter: 3.3"
• effective focuser travel: 85 mm
• focuser drawtube threads: M83 × 1 and M63 × 1
• standard visual-accessory interface: 2"
• support for 1.25" accessories: through the included 2"–1.25" twist-lock adapter
• focuser-shaft diameter for connection to a focusing motor: 6 mm
• equipment rotation: included CAA mechanism
• objective flange: integrated mini flange facilitating optical-axis adjustment and focal-plane stability
• tube rings: dual CNC-machined rings with side accessory mounting holes
• counterweight mounting points: located in the tube rings
• mounting rail: narrow dovetail plate
• carrying handle: Vixen-compatible, with additional mounting holes
• finderscope mounting: integrated base
• minimum length without the CAA and extension tube: approximately 402 mm
• minimum transport length with the dew shield and focuser retracted and the CAA and extension tube removed: approximately 355 mm
• maximum length with the CAA and extension tube: approximately 550 mm
• height in the compact configuration: approximately 181 mm
• OTA weight: approximately 4.3 kg
• total weight with the extension tube, CAA and objective cover: approximately 4.8 kg
• combined weight of the extension tube, CAA and objective cover: approximately 0.5 kg
• transport packaging: soft bag and double-layer carton

The combination of a compact Super ED triplet, f/6 focal ratio and advanced 3.3" focuser allows the telescope to be used both as a portable observing instrument and as the foundation of a wide-field astrophotography system.