SVBONY SV550 80mm f/6 Triplet APO Refractor Telescope OTA

Product Overview

The SVBONY SV550 80 is an 80 mm, 480 mm focal length apochromatic triplet refractor working at f/6. Its three-element objective pairs one FPL51 ED element with two correcting elements under full multi-coating, and SVBONY rates resolution at 1.45 arc seconds with a limiting stellar magnitude of 11.6. A 2.5″ rack-and-pinion focuser with 1:10 dual-speed fine focus carries up to 5 kg over 80 mm of travel.

The aluminium tube is 103 mm in outer diameter with a retractable dew shield, split tube rings and a Vixen-style dovetail (SVBONY lists 150–175 mm). Net weight is 3750 g, with the bare barrel at 2900 g. Behind the 2″ adapter sits an M63x1 female thread for the SV209 field flattener.

Who It's For

This is a good match if you:

• Image deep-sky targets: 480 mm at f/6 frames large nebulae, galaxies such as M31 and M33, and open clusters, and the SV209 flattens the field for full-frame sensors.
• Travel with your telescope: SVBONY built the SV550 80 as a compact travel refractor for observing and imaging.
• Observe with colour-free views: the triplet design keeps false colour off bright stars, the Moon and planets.
• Want a first apochromat: the SV550 80 is a straightforward step up from an achromat or a doublet ED scope.

Key Features & Design

• 80 mm f/6 triplet apochromat: 480 mm focal length with an FPL51 ED element and full multi-coating.
• 2.5″ rack-and-pinion focuser: dual speed at 1:10, 5 kg load rating and 80 mm travel; SVBONY notes the large drawtube helps control vignetting with full-frame cameras.
• Stray-light control: four internal extinction rings and a blackened interior.
• M63x1 female thread: for the SV209 flattener, reached by removing the 2″ adapter.
• Retractable dew shield and a finder base on the focuser.

Optical Design

The objective is a three-element apochromat: an S-FPL51 ED element works with two correcting elements to bring the visible spectrum to a common focus, which keeps blue fringing off bright stars and lunar edges. SVBONY reports a 15.8% image-quality improvement over its earlier design by spectrometer calculation. Full multi-coating, a blackened tube and internal extinction rings keep contrast high against a bright sky.

At f/6 and 480 mm the native field suits wide deep-sky framing. For flat stars across larger sensors, the SV209 is a 1.0x flattener for this telescope that keeps the focal length and focal plane, with 55 mm back focus via its M48 adapter.

Recommended Uses

• Deep-sky imaging: nebulae, galaxies and star clusters at 480 mm f/6.
• Visual observing: wide, colour-corrected views of star fields, the Moon and planets.
• Travel astronomy: a light, compact tube for dark-site trips.

Compatibility and Accessory Notes

• Visual: 2″ front adapter for 2″ diagonals; diagonal and eyepieces are sold separately (the SVBONY SV223 diagonal and SV230 or SV215 zoom eyepieces are offered alongside it by SVBONY).
• Imaging: SVBONY's instructions remove the 2″ adapter by loosening three small screws with an Allen wrench, exposing the M63x1 thread for the SV209 flattener.
• Back focus: 55 mm with the SV209 and its M48 adapter.
• Mounting: Vixen-style dovetail on split rings; at 3750 g the tube suits compact equatorial mounts.

If you would like your camera and filter spacing checked against the 55 mm figure, send us your setup and we will work it out with you.

Good to Know Before You Order

• Optical tube only: no mount, diagonal, eyepiece or flattener is included.
• Flat-field imaging: full-frame flat fields use the SV209 1.0x flattener, sold separately.
• Dovetail length: SVBONY's spec table lists 150–175 mm, while its feature list mentions a 180 mm plate.
• Style option: SVBONY also offers an SV550 Visual Set; this listing is the OTA.

Frequently Asked Questions

Is it difficult to set up?

No. The tube comes in its rings on a Vixen-style dovetail. Add a 2″ diagonal and eyepiece to observe; for imaging, three screws release the 2″ adapter and the SV209 threads on.

Which flattener does it use?

The SV209 1.0x flattener for the SV550 80 F6, with 55 mm back focus.

Can it carry a heavy camera?

SVBONY rates the 2.5″ focuser at 5 kg.

Is it for visual or imaging?

Both. SVBONY designed it for observation and astrophotography.

What is the tube outer diameter?

103 mm, useful when choosing a dew heater.

Bottom Line

In short: an 80 mm f/6 FPL51 triplet apochromat with a 2.5″ dual-speed focuser rated to 5 kg and an M63 thread for the SV209 flattener, at 3750 g. Add a mount and a diagonal or camera, and it is ready for travel observing and deep-sky imaging.