telescopecomparison · 2-way
Celestron EdgeHD 8 vs Takahashi TSA-120
Celestron
EdgeHD 8
Best suited for experienced imagers chasing detail running a backyard imaging setup.
Takahashi
TSA-120
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
Key differences
+126% focal length
+69% aperture
Slower by 2.5 f-stops
Specifications
| Specification | Celestron EdgeHD 8 | Takahashi TSA-120 |
|---|---|---|
| Optics | ||
| Type | SCT | Refractor |
| Optical design | Aplanatic SCT | Triplet APO |
| Aperture | 203mm | 120mm |
| Focal length | 2032mm | 900mm |
| Native f/ratio | f/10.0 | f/7.5 |
| Image circle | 42mm | 44mm |
| Full-frame support | Yes | Yes |
| Physical | ||
| Weight | 6.4kg | 7.5kg |
Advantages of Celestron EdgeHD 8
- Tighter framing — 2032mm vs 900mm focal length
- 69% more light-gathering aperture
Advantages of Takahashi TSA-120
- Wider field — 900mm vs 2032mm focal length
- Faster optics at f/7.5 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 — Takahashi TSA-120
- 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
Takahashi TSA-120 — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 2.29° × 1.53°Scale: 0.86"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 1.50° × 1.00°Scale: 0.86"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 0.72° × 0.72°Scale: 0.86"/px
Celestron EdgeHD 8 — recommended user
Best suited for experienced imagers chasing detail running a backyard imaging setup.
Takahashi TSA-120 — recommended user
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.