SVBONY SV545 203mm f/4.5 APO Astro Camera Lens (Full-Frame Ready)

The SVBONY SV545 is a compact, fast 203mm f/4.5 APO astro camera lens designed for wide-field deep-sky imaging. Its Petzval optical layout (5 elements in 3 groups) includes a built-in field flattener to help deliver sharp, well-corrected stars from centre to edge—ideal for modern CMOS cameras and wide-field nebula work.

Key Features

• Fast f/4.5 aperture for brighter frames and shorter exposure times
• Integrated field flattener supports edge-to-edge clarity without adding extra optics
• 44mm image circle for full-frame coverage (also excellent with APS-C)

• Fully Multi-Coated (FMC) optics to enhance transmission and reduce reflections

• Smooth integrated helical focuser for precise manual focusing

• CAA rotator for smooth framing rotation with secure locking

• M48 interface + 2" filter support for simple camera/filter integration

Built-In Field Flattener: Cleaner Stars Across the Frame

The SV545’s Petzval design incorporates a dedicated correcting group to flatten the field, helping to keep stars round and tight across the sensor—particularly valuable for wide-field mosaics, large nebulae, and full-frame imaging.

Full-Frame Imaging with a 44mm Image Circle

With a 44mm image circle, the SV545 is designed for full-frame cameras and delivers a generous illuminated field for wide panoramas of the Milky Way and large deep-sky targets.

Helical Focus + CAA Rotator for Easy Framing

The integrated helical focuser offers smooth manual control, while the CAA rotator enables full-angle rotation to dial in composition—then lock it down for stable imaging.

M48 Interface & 2" Filter Support

The rear connection uses an M48x0.75 male thread and supports a 2" filter holder, making it straightforward to add filters and connect common imaging accessories.

What’s Included

The SV545 package includes the lens and a complete accessory set for mounting and setup (carry bag, dovetail hardware, bracket parts, timing components, and tools as supplied by the manufacturer).

Specifications

FAQ

Is the SV545 suitable for full-frame cameras?

Yes—its 44mm image circle is designed to support full-frame sensors, while also working beautifully with APS-C and smaller formats.

Do I need an additional field flattener?

In most setups, no. The SV545 uses a Petzval design with a built-in field flattener, so you typically don’t need to add one.

Can I use 2" filters?

Yes—this lens supports a 2" filter holder and uses a common M48 interface for straightforward filter/camera integration.

Is an EAF included?

No—an EAF is not included. The SV545 includes mounting support for EAF-style focusing upgrades, depending on your chosen motor and configuration.