telescopecomparison · 2-way
Askar 71F vs Askar 120APO
Askar
120APO
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
Key differences
-42% focal length
-41% aperture
Specifications
| Specification | Askar 71F | Askar 120APO |
|---|---|---|
| Optics | ||
| Type | refractor | Refractor |
| Optical design | Petzval quintuplet FPL-51 | Triplet APO |
| Aperture | 71mm | 120mm |
| Focal length | 490mm | 840mm |
| Native f/ratio | f/6.9 | f/7.0 |
| Image circle | 44mm | 44mm |
| Full-frame support | Yes | Yes |
| Physical | ||
| Weight | 3.2kg | 8.5kg |
Advantages of Askar 71F
- Wider field — 490mm vs 840mm focal length
- Lighter (3.2kg vs 8.5kg) — easier to travel with
Advantages of Askar 120APO
- Tighter framing — 840mm vs 490mm focal length
- 69% more light-gathering aperture
Best for — Askar 71F
- Large emission nebulae and star clusters
- Full-frame astro cameras and DSLRs
Best for — Askar 120APO
- Medium-sized galaxies and planetary nebulae
- Full-frame astro cameras and DSLRs
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 — 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 — recommended user
Best suited for beginners and wide-field enthusiasts running a portable travel rig.
Askar 120APO — recommended user
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.