SVBONY · Achromat Refractor
SVBONY SV503 80mm ED Refractor
Compact ED refractor with built-in field flattener, ready for visual observing and imaging right out of the box
Performance Scores
Overview
The SVBONY SV503 is a 70mm f/6.78 ED refractor that punches above its price point by including a built-in field flattener, something most similarly priced scopes leave out entirely. That design choice matters: stars stay sharp and round across the full field of view, which benefits both visual observers and anyone attaching a camera for widefield imaging. The ED glass element does a solid job reducing chromatic aberration, the color fringing around bright objects that plagues standard achromats.
You will still see traces of false color on very bright targets like the moon or Venus, but it is well controlled for this aperture and price range. At 560mm focal length, this scope is well suited for open clusters, large nebulae like Orion, and widefield Milky Way sweeps. Smaller deep-sky objects and planetary detail are harder work at 70mm, so set your expectations accordingly.
The dual-speed focuser is a genuine convenience, especially when fine-tuning for high magnification or camera work. Weighing under 3kg, it pairs well with a lightweight mount, though the included alt-az mount will feel limiting if you plan serious astrophotography. Overall, it is a capable, honest performer for beginners stepping into quality optics.
At a Glance
70mm
Aperture
f/6.78
Focal Ratio
2.69kg
Weight
560mm
Focal Length
Specifications
Key Features
- Built-in field flattener eliminates the need to buy a separate accessory for flat, sharp images edge to edge
- ED glass reduces chromatic aberration noticeably compared to standard achromat refractors at this price
- Dual-speed focuser allows both quick initial focus and precise fine-tuning, useful for both visual and camera work
- 70mm aperture and f/6.78 focal ratio work best for widefield targets such as clusters, nebulae, and constellation framing
- Compact and lightweight at 2.69kg, making it easy to carry and mount on a travel-friendly setup
- 2-inch to 1.25-inch adapter included, giving flexibility to use a wide range of eyepieces and accessories
- At $359.99, the built-in flattener represents real cost savings compared to buying an equivalent optical train separately
Customer Reviews
335 reviews
I purchased the SVBONY SV503 70ED refractor telescope last summer, but due to weather (two hurricanes!) I was unable to try it out until late November. It performed beautifully! The first few targets were the Pleiades, Andromeda, and the North American Nebula. All came out fantastic. The FPL51 glass...
This is a very nice scope, especially for its price point. I've taken some lovely images using this scope. From the start, I've used the focal reducer and found I could never get round stars to the corners; it doesn't give a very flat image. This scope is undoubtedly a good buy and perfect for getti...
Purchased this scope because I figured with the Ohara FPL51 ED optics it should be half way decent but was really surprised with it performance vs price ratio. I owned way too many scopes in the past 30 years but wanted a decent ED refractor with a good built quality and a focuser that would not sli...