telescopecomparison · 2-way
Askar 120APO vs Vixen SD115S
Askar
120APO
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
Vixen
SD115S
Best suited for intermediate imagers building a versatile kit running a portable travel rig.
Key differences
-6% focal length
Faster by 0.7 f-stops
Specifications
| Specification | Askar 120APO | Vixen SD115S |
|---|---|---|
| Optics | ||
| Type | Refractor | refractor |
| Optical design | Triplet APO | Apo doublet SD |
| Aperture | 120mm | 115mm |
| Focal length | 840mm | 890mm |
| Native f/ratio | f/7.0 | f/7.7 |
| Image circle | 44mm | 44mm |
| Full-frame support | Yes | Yes |
| Physical | ||
| Weight | 8.5kg | 4.8kg |
Advantages of Askar 120APO
- Faster optics at f/7 vs f/7.7
Advantages of Vixen SD115S
- Lighter (4.8kg vs 8.5kg) — easier to travel with
Best for — Askar 120APO
- Medium-sized galaxies and planetary nebulae
- Full-frame astro cameras and DSLRs
Best for — Vixen SD115S
- Medium-sized galaxies and planetary nebulae
- Full-frame astro cameras and DSLRs
Askar 120APO — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 2.46° × 1.64°Scale: 0.92"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 1.60° × 1.07°Scale: 0.92"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 0.77° × 0.77°Scale: 0.92"/px
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
Askar 120APO — recommended user
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
Vixen SD115S — recommended user
Best suited for intermediate imagers building a versatile kit running a portable travel rig.