telescopecomparison · 2-way
Vixen SD103S vs Askar 107PHQ
Vixen
SD103S
Best suited for intermediate imagers building a versatile kit running a portable travel rig.
Askar
107PHQ
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
Key differences
+6% focal length
Slower by 0.7 f-stops
Specifications
| Specification | Vixen SD103S | Askar 107PHQ |
|---|---|---|
| Optics | ||
| Type | refractor | refractor |
| Optical design | Apo doublet SD | Petzval quintuplet FPL-51 |
| Aperture | 103mm | 107mm |
| Focal length | 795mm | 749mm |
| Native f/ratio | f/7.7 | f/7.0 |
| Image circle | 44mm | 44mm |
| Full-frame support | Yes | Yes |
| Physical | ||
| Weight | 4.0kg | 7.5kg |
Advantages of Vixen SD103S
- Lighter (4kg vs 7.5kg) — easier to travel with
Advantages of Askar 107PHQ
- Faster optics at f/7 vs f/7.7
Best for — Vixen SD103S
- Medium-sized galaxies and planetary nebulae
- Full-frame astro cameras and DSLRs
Best for — Askar 107PHQ
- Medium-sized galaxies and planetary nebulae
- Full-frame astro cameras and DSLRs
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
Askar 107PHQ — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 2.75° × 1.84°Scale: 1.04"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 1.80° × 1.20°Scale: 1.04"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 0.86° × 0.86°Scale: 1.04"/px
Vixen SD103S — recommended user
Best suited for intermediate imagers building a versatile kit running a portable travel rig.
Askar 107PHQ — recommended user
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.