SV503 102ED Telescope - 0.8x Focal Reducer/Field Flattener Combination
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Key Features
102 mm extra‑low dispersion doublet refractor minimizes chromatic aberration for sharper celestial views.
SV193 0.8× focal reducer & field flattener widens field and improves edge sharpness for astrophotography.
Optimized for deep‑sky photography and visual observing with DSLR or dedicated astro cameras.
Rack‑and‑pinion focuser with fine adjustment supports accurate focus for detailed imaging.
Durable aluminum OTA with dovetail mounting ensures reliable setup and balanced performance.
The SV503 series includes SV503 102ED telescope refractor OTA and SV193 0.8x flattener & focal reducer. It is suitable for visual observation and deep-sky photography.
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| Product Name | SV503 70F6 ED Astronomy Telescope | SV503 80F7 ED Astronomy Telescope | SV503 102F7 ED Astronomy Telescope |
| Type | Refractor | Refractor | Refractor |
| ED Glass | S-FPL51 | S-FPL51 | S-FPL51 |
| Coating | SMC | SMC | SMC |
| Aperture | 70mm / 2.75-Inch | 80mm /3-Inch | 102mm / 4.01-Inch |
| Focal length | 420mm | 560mm | 714mm |
| Focal Ratio | f/6 | f/7 | f/7 |
| Type of Focuser | RAP (Rack and Pinion) | RAP (Rack and Pinion) | RAP (Rack and Pinion) |
| Gear Reduction | 1:10 Fine movement | 1:10 Fine movement | 1:10 Fine movement |
| Resolving capacity | 1.97" | 1.5" | 1.17" |
| Limit value | 11.3 | 11.6 | 12.1 |
| Light gathering capacity | 100x | 130.6x | 212x |
| Max. Useful magnification | 140x | 160x | 204x |
| Tube weight | 3.35kg | 3.95kg | 5.5kg |
| Tube outer diameter | 88mm | 121mm | |
| Tube material | Aluminum | Aluminum | Aluminum |
| Back Focus Length | 90mm | 90mm | 101.9mm |
| OTA Length | 318mm | 465mm | 630mm |
| Dovetail & Ring | Yes | Yes | Yes |
| Dovetail Length | 150mm | 137mm | 200mm |
| Model | SV193 | |||
| SKU | W9152B | W9152D | ||
| Back focus | 55mm | |||
| Barrel size | 2-inch | 2-inch | ||
| Threads Standard | M48*0.75 | M48*0.75 | ||
| Lens Structure | 3-Elements/2Groups | 3-Elements/2Groups | ||
| Lens Coating | FMC | FMC | ||
| Blackened Lens Edges | Yes | Yes | ||
| Net Weight | 164g / 5.78oz / 0.36lb | 177g / 6.24oz / 0.39lb | ||
1. The popular SV503 series refractor will provide the best optical quality, whether you use it for Deep-Sky Object or Planets, visual or photography;
2. The compatible SV193 reducer will increase the field of view and improve the image flatness， which is essential for deep-sky photography.
Telescopes
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