PegasusAstro Orbit Rotating Diagonal

The PegasusAstro Orbit Diagonal is a compact, modular 1.25" rotating diagonal designed for optical systems with limited backfocus, including the PegasusAstro SmartEye. Its ultra-short optical design and dual-axis rotation provide comfortable viewing angles while maintaining a compact and secure connection to your telescope.

Featuring a high-quality first-surface mirror, versatile threading options, and an integrated 1.25" filter thread, the Orbit Diagonal delivers excellent optical performance without the bulk of traditional 2" diagonals. Its design is optimized to fully illuminate the 16 mm diagonal of the Sony IMX533 sensor without vignetting.

The Orbit is available in three configurations to accommodate different telescope connections and backfocus requirements.

Expected Availability: October 2026

Key Features

Compact 1.25" Optical Design: Ultra-short backfocus allows the diagonal to work with optical systems where larger 2" diagonals may prevent proper focus.
Dual-Axis Rotation: Independently rotate the telescope connection and SmartEye for comfortable viewing regardless of telescope orientation.
High-Quality First-Surface Mirror: Precision BK7 mirror with enhanced aluminum coatings and protective overcoatings for excellent reflectivity and durability.
Dual Thumbscrew Adjustment: Convenient thumbscrews allow independent rotation and secure positioning.
Versatile Threaded Connections: M48 male and M42 female threading provide flexible attachment options for compatible adapters and optical accessories.
Optimized Backfocus: Each edition is designed to accommodate specific telescope configurations and optical spacing requirements.
Integrated 1.25" Filter Thread: Accepts standard 1.25" astronomical filters, providing a convenient and economical alternative to larger 2" filters.
SmartEye Compatibility: Designed for use with the PegasusAstro SmartEye, with an included M54-to-M48 adapter for direct attachment.

Available Configurations

Orbit Diagonal Basic Edition (PEG-ORBIT)

The Orbit Diagonal Basic Edition offers a compact and versatile solution for telescopes requiring minimal backfocus. Its modular construction and dual-axis rotation allow flexible positioning of the SmartEye or compatible optical accessories.

Features and Specifications:

Mirror: BK7 first-surface mirror
Surface Accuracy: λ/10 at 633 nm
Coating: Enhanced aluminum with protective overcoat
Average Reflectivity: ≥92% across 450–650 nm at a 45° angle of incidence
Telescope Connection: Removable 1.25" nosepiece
Threading: M48 male and M42 female connections on both sides
Backfocus: 58 mm between the specified M48 connection reference points
Rotation: Independent dual-axis adjustment with thumbscrew locking
Filter Compatibility: Integrated standard 1.25" filter thread

The dual-thread design allows the diagonal to connect directly to compatible spacers, cameras, and custom adapters without relying exclusively on traditional nosepiece connections.

Orbit Diagonal SCT 2" Edition (PEG-ORBIT-SCT2INCH)

The Orbit Diagonal SCT 2" Edition is designed for Schmidt-Cassegrain telescopes and compatible reducers or correctors equipped with a standard 2" SCT threaded connection.

Features and Specifications:

Direct SCT Connection: Attaches to compatible 2" SCT threaded visual backs, including those found on many Celestron and Meade SCTs.
Reducer Compatibility: Suitable for compatible SCT accessories, including the Celestron f/6.3 Reducer/Corrector.
Optimized Backfocus: Designed to accommodate optical configurations requiring approximately 105 mm of backfocus.
Rigid Threaded Attachment: Secure 2" SCT connection helps minimize movement and unwanted tilt.
Universal SmartEye-Side Threading: M48 male and M42 female connections allow flexible accessory attachment.
Dual-Axis Rotation: Provides convenient viewing-angle adjustment without compromising the threaded telescope connection.

This edition provides a stable, low-profile solution for SCT users seeking a rotating diagonal while maintaining the optical spacing required by their imaging system.

Orbit Diagonal SCT Edge Edition (PEG-ORBIT-EDGE)

The Orbit Diagonal SCT Edge Edition is specifically designed for compatible Celestron EdgeHD telescopes and optical accessories featuring a 3.25" threaded rear connection.

Its adjustable neck provides additional flexibility for achieving the correct optical spacing, making it particularly useful for systems with strict backfocus requirements.

Features and Specifications:

Direct 3.25" SCT Connection: Designed for compatible Celestron EdgeHD telescopes and optical accessories, including applicable 0.7x focal reducers.
Adjustable Neck: Integrated variable-length neck with 20 mm of adjustment travel.
Secure Locking Mechanism: Locks the adjustable neck in position to maintain consistent optical spacing.
Optimized Backfocus: Designed to accommodate configurations requiring approximately 146 mm of backfocus.
High-Stability Connection: Rigid 3.25" threaded attachment helps minimize flexure and tilt.
Universal SmartEye-Side Threading: M48 male and M42 female connections provide compatibility with a range of adapters and accessories.
Dual-Axis Rotation: Allows comfortable viewing orientation regardless of telescope position.

The adjustable neck eliminates the need for multiple fixed-length spacers in compatible configurations, making it easier to fine-tune optical spacing.

Note: Backfocus requirements vary depending on the telescope model, reducer, and accessory configuration. Always verify the required optical spacing for your specific setup.

What's Included

Orbit Diagonal Basic (PEG-ORBIT)

PegasusAstro Orbit Diagonal
1.25" Nosepiece
2 × Silicone Protective Caps
M54 Male to M48 Female Adapter

Orbit Diagonal SCT 2" (PEG-ORBIT-SCT2INCH)

PegasusAstro Orbit Diagonal
2 × Silicone Protective Caps
M54 Male to M48 Female Adapter
Compression Ring
SCT 2" Neck and Lock

Orbit Diagonal SCT Edge (PEG-ORBIT-EDGE)

PegasusAstro Orbit Diagonal
2 × Silicone Protective Caps
M54 Male to M48 Female Adapter
Compression Ring
SCT Edge Variable Adapter
3.25" to M68 Male Adapter

The PegasusAstro Orbit Diagonal combines precise optical performance, flexible connectivity, and ergonomic rotation in a compact design. Whether used with a standard telescope, an SCT, or a Celestron EdgeHD system, its modular construction offers a convenient way to integrate the SmartEye while accommodating demanding backfocus requirements.