SVBONY Refractor Telescope for Astrophotography SV503 80 | Svbony
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The SV503 80ED OTA arrives paired with the 0.8X photo reducer/flattener — no trial-and-error accessory matching. With a 2" dual-speed focuser, ED glass optics and a 360° rotation focuser wheel, just attach your camera and start imaging right out of the box.
Faster Imaging System
The 0.8X reducer cuts the effective focal length from 560mm f/7 to 448mm f/5.6, capturing more signal in every exposure. Shorter exposures mean fewer tracking errors, more targets per night, and easier deep-sky imaging.

Wider Field of View
The 0.8X focal reducer expands your imaging area by about 56%, revealing more sky in every frame. Ideal for capturing large nebulae, star clusters and galaxies that don't fit a native field.
Sharper Edge-to-Edge Imaging
The 3-element field flattener corrects field curvature, keeping stars tight and round from center to corner. Full-frame and large sensors can finally use the entire imaging plane.

Precise Optical Path, Standard 55mm Back Focus
Engineered dimensions you can plan around: the 0.8X reducer/flattener delivers a standard 55mm back focus, compatible with most cameras, spacers and filter drawers — build your imaging train with confidence.
SV503 80ED — Clear, Bright & Reliable Imaging
An 80mm ED doublet with ultra-wideband multilayer coating delivers high contrast and minimal chromatic aberration. A dependable optical foundation for deep-sky imaging, night after night.
0.8X Focal Reducer & Flattener, Built for the SV503
Seamless compatibility with the SV503 80ED: 3-element optical design, standard 55mm back focus and M48 connection. Faster, sharper deep-sky imaging with zero guesswork.


The SV503 80ED OTA arrives paired with the 0.8X photo reducer/flattener — no trial-and-error accessory matching. With a 2" dual-speed focuser, ED glass optics and a 360° rotation focuser wheel, just attach your camera and start imaging right out of the box.
Faster Imaging System
The 0.8X reducer cuts the effective focal length from 560mm f/7 to 448mm f/5.6, capturing more signal in every exposure. Shorter exposures mean fewer tracking errors, more targets per night, and easier deep-sky imaging.

Wider Field of View
The 0.8X focal reducer expands your imaging area by about 56%, revealing more sky in every frame. Ideal for capturing large nebulae, star clusters and galaxies that don't fit a native field.
Sharper Edge-to-Edge Imaging
The 3-element field flattener corrects field curvature, keeping stars tight and round from center to corner. Full-frame and large sensors can finally use the entire imaging plane.

Precise Optical Path, Standard 55mm Back Focus
Engineered dimensions you can plan around: the 0.8X reducer/flattener delivers a standard 55mm back focus, compatible with most cameras, spacers and filter drawers — build your imaging train with confidence.
SV503 80ED — Clear, Bright & Reliable Imaging
An 80mm ED doublet with ultra-wideband multilayer coating delivers high contrast and minimal chromatic aberration. A dependable optical foundation for deep-sky imaging, night after night.
0.8X Focal Reducer & Flattener, Built for the SV503
Seamless compatibility with the SV503 80ED: 3-element optical design, standard 55mm back focus and M48 connection. Faster, sharper deep-sky imaging with zero guesswork.


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Product Question
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Extra-Low Dispersion Glass
Delivers high-contrast, sharp, and color-accurate images.
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Fully Multi-Coated Optics
The entire optical lens utilizes ultra-wideband multi-layer coating technology, providing exceptional performance.
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Dual-Speed Focuser
It is equipped with a 1:10 dual-speed rack-and-pinion focuser, which ensures smooth and precise focusing adjustments.
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CNC Craftsmanship
Precision‑machined from high‑grade materials, with a finely textured painted exterior.
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360° Rotating
Features a rotatable focuser for flexible framing.
Sharper Edge-to-Edge Imaging
0.8X Focal Reducer & Flattener, Built for the SV503
