SVBONY · Achromat Refractor
SVBONY SV503 102mm ED Refractor
Sharp color, serious glass: the SV503 102mm ED brings crisp planetary and deep-sky views at a genuine entry point for astrophotography.
Price updated Mar 22, 2026
Performance Scores
Overview
The SVBONY SV503 102mm is a 102mm ED refractor with a 560mm focal length at f/7, making it a versatile option for both visual observing and entry-level astrophotography. The S-FPL51 ED glass element does meaningful work here, keeping chromatic aberration noticeably lower than a standard achromat of this size, though experienced observers should understand that ED glass at this price point will not fully eliminate color fringing on very bright targets like the Moon or Venus. At f/7, the focal ratio strikes a reasonable balance between planetary detail and wider deep-sky fields, though you will want a quality field flattener for critical astrophotography work.
The dual-speed focuser with a 1:10 reduction ratio makes precise focus achievable without frustration, and the 360-degree field rotator is a genuinely practical feature for composing astrophotos without repositioning the entire tube. The 90mm of focus travel accommodates accessories like filter wheels without running out of inward focus, which is a common problem with some refractors. At 3.94kg, it pairs well with a mid-range mount.
For the price, this is a competitive and capable instrument worth serious consideration.
At a Glance
102mm
Aperture
f/7
Focal Ratio
3.94kg
Weight
560mm
Focal Length
Specifications
Key Features
- S-FPL51 ED glass significantly reduces color fringing compared to standard achromats, improving planetary contrast and image sharpness
- The 560mm focal length at f/7 works for both planetary observation and wide deep-sky imaging without requiring extreme accessories
- Dual-speed focuser with 1:10 ratio allows fine, controlled focus adjustments that matter most during astrophotography
- 360-degree field rotator lets you align your camera sensor without rotating the entire optical tube, saving time during setup
- 90mm of focus travel accommodates filter wheels, field flatteners, and other imaging accessories without focus position issues
- Retractable dew shield reduces stray light and slows dew formation, extending usable observing time in humid conditions
- At 3.94kg, the tube is light enough for a quality mid-range mount like an EQ5-class or comparable alt-az, keeping your overall cost manageable
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...