telescopecomparison · 2-way
Askar 120APO vs Askar 71F
Askar
120APO
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
Key differences
+71% focal length
+69% aperture
Specifications
| Specification | Askar 120APO | Askar 71F |
|---|---|---|
| Optics | ||
| Type | Refractor | refractor |
| Optical design | Triplet APO | Petzval quintuplet FPL-51 |
| Aperture | 120mm | 71mm |
| Focal length | 840mm | 490mm |
| Native f/ratio | f/7.0 | f/6.9 |
| Image circle | 44mm | 44mm |
| Full-frame support | Yes | Yes |
| Physical | ||
| Weight | 8.5kg | 3.2kg |
Advantages of Askar 120APO
- Tighter framing — 840mm vs 490mm focal length
- 69% more light-gathering aperture
Advantages of Askar 71F
- Wider field — 490mm vs 840mm focal length
- Lighter (3.2kg 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 — Askar 71F
- 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
Askar 71F — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 4.21° × 2.81°Scale: 1.58"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 2.75° × 1.84°Scale: 1.58"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 1.32° × 1.32°Scale: 1.58"/px
Askar 120APO — recommended user
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
Askar 71F — recommended user
Best suited for beginners and wide-field enthusiasts running a portable travel rig.