Svbony provided me with a Svbony SV503 70F6 ED telescope for review. This is a small 70 mm refractor with a two-lens cell, and one of the lenses is made of S-FPL51 glass. The use of ED glass provides a significant reduction in color halo (longitudinal chromatic aberration) around bright objects compared to a classic achromatic refractor of the same focal length. I also received a native Svbony SV193 0.8x (0.8x for 70F6ED) field flattener for this refractor for review.
Svbony SV503 70F6 ED
Svbony SV503 70F6 ED can also be used as a spotting scope. And if the 80 mm ED version of the telescope is too large for such purposes, then the 70 mm version is already quite compact and mobile. Of course, a dedicated spotting scope will be even lighter and more compact, but if you need a versatile device for astronomical and terrestrial observations, then the SV5o3 70 ED will be a good choice.
The manufacturer has declared the following characteristics:
| Product Name | SVBONY SV503 70F6 ED Astronomy Telescope |
| Type | Refractor |
| ED Glass | S-FPL51 |
| Coating | SMC |
| Aperture | 70mm / 2.75-Inch |
| Focal length | 420mm |
| Focal Ratio | f/6 |
| Type of Focuser | RAP (Rack and Pinion) |
| Gear Reduction | 1:10 Fine movement |
| Resolving capacity | 1.97″ |
| Limit value | 11.3 |
| Light gathering capacity | 100x |
| Max. Useful magnification | 140x |
| Tube weight | 2.22kg |
| Tube outer diameter | 88mm |
| Tube material | Aluminium |
| Back Focus Length | 90mm |
| OTA Length | 318mm |
| Dovetail & Ring | Yes |
| Dovetail Length | 150mm |
