telescopecomparison · 2-way
Askar 120APO vs Tele Vue NP101is
Askar
120APO
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
Tele Vue
NP101is
Best suited for intermediate imagers building a versatile kit running a portable travel rig.
Key differences
+56% focal length
+19% aperture
Slower by 1.6 f-stops
Specifications
| Specification | Askar 120APO | Tele Vue NP101is |
|---|---|---|
| Optics | ||
| Type | Refractor | Refractor |
| Optical design | Triplet APO | Petzval |
| Aperture | 120mm | 101mm |
| Focal length | 840mm | 540mm |
| Native f/ratio | f/7.0 | f/5.4 |
| Image circle | 44mm | 40mm |
| Full-frame support | Yes | Yes |
| Physical | ||
| Weight | 8.5kg | 4.5kg |
Advantages of Askar 120APO
- Tighter framing — 840mm vs 540mm focal length
- 19% more light-gathering aperture
Advantages of Tele Vue NP101is
- Wider field — 540mm vs 840mm focal length
- Faster optics at f/5.4 vs f/7
- Lighter (4.5kg 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 — Tele Vue NP101is
- Large emission nebulae and star clusters
- 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
Tele Vue NP101is — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 3.82° × 2.55°Scale: 1.44"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 2.49° × 1.67°Scale: 1.44"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 1.20° × 1.20°Scale: 1.44"/px
Askar 120APO — recommended user
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
Tele Vue NP101is — recommended user
Best suited for intermediate imagers building a versatile kit running a portable travel rig.