telescopecomparison · 2-way
Celestron EdgeHD 8 vs Sky-Watcher Esprit 120ED
Celestron
EdgeHD 8
Best suited for experienced imagers chasing detail running a backyard imaging setup.
Sky-Watcher
Esprit 120ED
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
Key differences
+142% focal length
+69% aperture
Slower by 3.0 f-stops
Specifications
| Specification | Celestron EdgeHD 8 | Sky-Watcher Esprit 120ED |
|---|---|---|
| Optics | ||
| Type | SCT | Refractor |
| Optical design | Aplanatic SCT | Triplet APO |
| Aperture | 203mm | 120mm |
| Focal length | 2032mm | 840mm |
| Native f/ratio | f/10.0 | f/7.0 |
| Image circle | 42mm | 44mm |
| Full-frame support | Yes | Yes |
| Physical | ||
| Weight | 6.4kg | 11.5kg |
Advantages of Celestron EdgeHD 8
- Tighter framing — 2032mm vs 840mm focal length
- 69% more light-gathering aperture
- Lighter (6.4kg vs 11.5kg) — easier to travel with
Advantages of Sky-Watcher Esprit 120ED
- Wider field — 840mm vs 2032mm focal length
- Faster optics at f/7 vs f/10
Best for — Celestron EdgeHD 8
- Small galaxies, planetary nebulae, lunar & planetary detail
- High-resolution long-exposure work
- Faint-object imaging under dark skies
- Full-frame astro cameras and DSLRs
Best for — Sky-Watcher Esprit 120ED
- Medium-sized galaxies and planetary nebulae
- Full-frame astro cameras and DSLRs
Celestron EdgeHD 8 — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 1.02° × 0.68°Scale: 0.38"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 0.66° × 0.44°Scale: 0.38"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 0.32° × 0.32°Scale: 0.38"/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
Celestron EdgeHD 8 — recommended user
Best suited for experienced imagers chasing detail running a backyard imaging setup.
Sky-Watcher Esprit 120ED — recommended user
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
