ORBIT DIAGONAL SCT 2-INCH

Pegasus Astro Orbit Diagonal SCT 2-Inch Edition

The Pegasus Astro Orbit is a modular 1.25" rotating diagonal designed for optical systems with very limited backfocus, such as the Pegasus SmartEye. The SCT 2-Inch Edition threads directly onto telescopes and accessories with a standard 2" SCT thread, like Celestron and Meade Schmidt-Cassegrains and the Celestron 0.63x reducer.

Quick Overview

• Compact 1.25" optical design with ultra-short backfocus
• Fully illuminates the IMX533 sensor (16 mm diagonal) with no vignetting
• BK7 first-surface mirror, enhanced aluminium with protective overcoat
• Dual-axis rotation with independent thumb screws
• Direct 2" SCT coupling with optimized backfocus for 105 mm systems
• Universal M48 male / M42 female threading on the SmartEye side
• Integrated 1.25" filter thread

Compact 1.25" Optical Design

Bulky 2" diagonals often push the focal plane out of reach. Thanks to its ultra-short optical path, the Orbit lets your telescope reach focus with SmartEye and other compact cameras, while still fully illuminating sensors such as the IMX533 with zero vignetting.

High Quality Mirror

The diagonal uses a BK7 first-surface mirror with lambda/10 surface accuracy at 633 nm and an enhanced aluminium coating with protective overcoat, offering an average reflectivity of 92% or more in the 450-650 nm range.

Dual-Axis Rotation

Two tactile thumb screws allow independent rotation of the nosepiece side and the SmartEye side, so you always have a comfortable viewing position regardless of the orientation of your telescope.

Direct SCT Coupling

The SCT 2-Inch Edition is designed for telescopes and optical accessories with a standard 2" SCT threaded visual back, such as Celestron and Meade Schmidt-Cassegrain telescopes or the Celestron 0.63x reducer/corrector. The threaded connection is rigid and tilt-free, even under heavy loads.

Optimized Backfocus

The diagonal is engineered to help you meet the 105 mm backfocus requirement of SCT reducers and correctors, which is critical for flat fields and round stars across the frame.

Universal Threading

The SmartEye side keeps the dual-thread design with M48 male and M42 female threads, so you can connect the diagonal directly to spacers, cameras or custom adapters. SmartEye attaches directly using the included M54M-M48F adapter.

Integrated Filter Thread

A thread on the top side accepts standard 1.25" filters, a cost-effective alternative to 2" filters, without vignetting thanks to the short backfocus.

Documentation

• Orbit Diagonal Product Manual (PDF)