telescopecomparison · 2-way
Askar 151PHQ vs Sky-Watcher Esprit 120ED
Askar
151PHQ
Best suited for intermediate imagers building a versatile kit running a permanent observatory setup.
Sky-Watcher
Esprit 120ED
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
Key differences
+26% focal length
+26% aperture
Specifications
| Specification | Askar 151PHQ | Sky-Watcher Esprit 120ED |
|---|---|---|
| Optics | ||
| Type | refractor | Refractor |
| Optical design | Petzval quintuplet FPL-51 | Triplet APO |
| Aperture | 151mm | 120mm |
| Focal length | 1057mm | 840mm |
| Native f/ratio | f/7.0 | f/7.0 |
| Image circle | 60mm | 44mm |
| Full-frame support | Yes | Yes |
| Physical | ||
| Weight | 15.5kg | 11.5kg |
Advantages of Askar 151PHQ
- Tighter framing — 1057mm vs 840mm focal length
- 26% more light-gathering aperture
- Larger image circle (60mm) — supports bigger sensors
Advantages of Sky-Watcher Esprit 120ED
- Wider field — 840mm vs 1057mm focal length
- Lighter (11.5kg vs 15.5kg) — easier to travel with
Best for — Askar 151PHQ
- Medium-sized galaxies and planetary nebulae
- Full-frame astro cameras and DSLRs
Best for — Sky-Watcher Esprit 120ED
- Medium-sized galaxies and planetary nebulae
- Full-frame astro cameras and DSLRs
Askar 151PHQ — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 1.95° × 1.30°Scale: 0.73"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 1.27° × 0.85°Scale: 0.73"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 0.61° × 0.61°Scale: 0.73"/px
Sky-Watcher Esprit 120ED — 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 151PHQ — recommended user
Best suited for intermediate imagers building a versatile kit running a permanent observatory setup.
Sky-Watcher Esprit 120ED — recommended user
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
