telescopecomparison · 2-way
Vixen SD115S vs Vixen SD103S
Vixen
SD115S
Best suited for intermediate imagers building a versatile kit running a portable travel rig.
Vixen
SD103S
Best suited for intermediate imagers building a versatile kit running a portable travel rig.
Key differences
+12% focal length
+12% aperture
Specifications
| Specification | Vixen SD115S | Vixen SD103S |
|---|---|---|
| Optics | ||
| Type | refractor | refractor |
| Optical design | Apo doublet SD | Apo doublet SD |
| Aperture | 115mm | 103mm |
| Focal length | 890mm | 795mm |
| Native f/ratio | f/7.7 | f/7.7 |
| Image circle | 44mm | 44mm |
| Full-frame support | Yes | Yes |
| Physical | ||
| Weight | 4.8kg | 4.0kg |
Advantages of Vixen SD115S
- Tighter framing — 890mm vs 795mm focal length
- 12% more light-gathering aperture
Advantages of Vixen SD103S
- Wider field — 795mm vs 890mm focal length
- Lighter (4kg vs 4.8kg) — easier to travel with
Best for — Vixen SD115S
- Medium-sized galaxies and planetary nebulae
- Full-frame astro cameras and DSLRs
Best for — Vixen SD103S
- Medium-sized galaxies and planetary nebulae
- Full-frame astro cameras and DSLRs
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 SD103S — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 2.59° × 1.73°Scale: 0.98"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 1.69° × 1.13°Scale: 0.98"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 0.81° × 0.81°Scale: 0.98"/px
Vixen SD115S — recommended user
Best suited for intermediate imagers building a versatile kit running a portable travel rig.
Vixen SD103S — recommended user
Best suited for intermediate imagers building a versatile kit running a portable travel rig.