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
| Brand | SVBONY |
| Model | SV545 |
| Optical Design | Petzval (5 elements in 3 groups) |
| Clear Aperture | 45mm |
| Focal Length | 203mm |
| Focal Ratio | f/4.5 |
| Coatings | FMC (Fully Multi-Coated) |
| Focuser | Integrated helical |
| Image Circle | 44mm |
| Rotation | Lockable 360° rotator (CAA) |
| Rear Connection | M48x0.75 male thread |
| Mounting | Dovetail plate (double-sided style) |
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.