telescopecomparison · 2-way
Vixen SD115S vs Vixen R200SS
Vixen
SD115S
Best suited for intermediate imagers building a versatile kit running a portable travel rig.
Vixen
R200SS
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
Key differences
+11% focal length
-42% aperture
Slower by 3.7 f-stops
Specifications
| Specification | Vixen SD115S | Vixen R200SS |
|---|---|---|
| Optics | ||
| Type | refractor | newtonian |
| Optical design | Apo doublet SD | Newtonian astrograph |
| Aperture | 115mm | 200mm |
| Focal length | 890mm | 800mm |
| Native f/ratio | f/7.7 | f/4.0 |
| Image circle | 44mm | — |
| Full-frame support | Yes | No |
| Physical | ||
| Weight | 4.8kg | 7.5kg |
Advantages of Vixen SD115S
- Tighter framing — 890mm vs 800mm focal length
- Larger image circle (44mm) — supports bigger sensors
- Lighter (4.8kg vs 7.5kg) — easier to travel with
Advantages of Vixen R200SS
- Wider field — 800mm vs 890mm focal length
- 74% more light-gathering aperture
- Faster optics at f/4 vs f/7.7
Best for — Vixen SD115S
- Medium-sized galaxies and planetary nebulae
- Full-frame astro cameras and DSLRs
Best for — Vixen R200SS
- Medium-sized galaxies and planetary nebulae
- Fast imaging — short exposures per sub
- Faint-object imaging under dark skies
Vixen SD115S — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 2.32° × 1.55°Scale: 0.87"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 1.51° × 1.01°Scale: 0.87"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 0.73° × 0.73°Scale: 0.87"/px
Vixen R200SS — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 2.58° × 1.72°Scale: 0.97"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 1.68° × 1.12°Scale: 0.97"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 0.81° × 0.81°Scale: 0.97"/px
Vixen SD115S — recommended user
Best suited for intermediate imagers building a versatile kit running a portable travel rig.
Vixen R200SS — recommended user
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.