telescopecomparison · 2-way
Celestron EdgeHD 9.25 vs Takahashi Epsilon-180ED
Celestron
EdgeHD 9.25
Best suited for experienced imagers chasing detail running a backyard imaging setup.
Takahashi
Epsilon-180ED
Best suited for beginners and wide-field enthusiasts running a permanent observatory setup.
Key differences
+370% focal length
+31% aperture
Slower by 7.2 f-stops
Specifications
| Specification | Celestron EdgeHD 9.25 | Takahashi Epsilon-180ED |
|---|---|---|
| Optics | ||
| Type | SCT | astrograph |
| Optical design | Aplanatic SCT | Hyperbolic Newtonian |
| Aperture | 235mm | 180mm |
| Focal length | 2350mm | 500mm |
| Native f/ratio | f/10.0 | f/2.8 |
| Image circle | 42mm | 44mm |
| Full-frame support | Yes | Yes |
| Physical | ||
| Weight | 9.5kg | 12.5kg |
Advantages of Celestron EdgeHD 9.25
- Tighter framing — 2350mm vs 500mm focal length
- 31% more light-gathering aperture
- Lighter (9.5kg vs 12.5kg) — easier to travel with
Advantages of Takahashi Epsilon-180ED
- Wider field — 500mm vs 2350mm focal length
- Faster optics at f/2.8 vs f/10
Best for — Celestron EdgeHD 9.25
- 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 — Takahashi Epsilon-180ED
- Large emission nebulae and star clusters
- Fast imaging — short exposures per sub
- Full-frame astro cameras and DSLRs
Celestron EdgeHD 9.25 — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 0.88° × 0.59°Scale: 0.33"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 0.57° × 0.38°Scale: 0.33"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 0.28° × 0.28°Scale: 0.33"/px
Takahashi Epsilon-180ED — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 4.13° × 2.75°Scale: 1.55"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 2.69° × 1.80°Scale: 1.55"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 1.29° × 1.29°Scale: 1.55"/px
Celestron EdgeHD 9.25 — recommended user
Best suited for experienced imagers chasing detail running a backyard imaging setup.
Takahashi Epsilon-180ED — recommended user
Best suited for beginners and wide-field enthusiasts running a permanent observatory setup.