The Svbony SV545 45/203 F/4.5 is a compact Petzval refractor designed as a high-performance astrograph with a built-in flat field. Its advanced 5-element optical system arranged in 3 groups delivers a naturally flat image plane without the need for an additional field flattener, simplifying the imaging train and eliminating backfocus calculations. The optical design is optimized for modern wide-field astrophotography.

Key features

• Petzval refractor design (5 elements in 3 groups)
• built-in flat field – no external flattener required
• fast f/4.5 optical system for wide-field astrophotography
• precision helical focuser with locking mechanism
• integrated 360° rear rotator with lock
• M48 × 0.75 male rear thread for direct camera connection
• EAF-ready design (EAF mounting kit included)
• full compatibility with 2" filters via integrated filter holder

Package contents

• Svbony SV545 optical tube
• EAF mounting kit
• carrying handle with integrated Vixen finder saddle
• dovetail mounting plate
• camera angle adjuster
• 2" filter holder (pre-installed)
• plastic objective lens cover
• M48 metal rear cover
• soft padded carrying case
• wrench and mounting screws
• instruction manual

Technical specifications

• model: SV545
• optical design: Petzval, 5 elements in 3 groups
• aperture: 45 mm
• focal length: 203 mm
• focal ratio: f/4.5
• optical coatings: FMC (Fully Multi-Coated)
• focuser type: helical
• rotator: 360° lockable
• rear connection: M48 × 0.75 male thread
• mounting type: dovetail plate
• tube weight: approx. 2750 g