telescopecomparison · 2-way
Takahashi Mewlon-210 vs Celestron RASA 8
Takahashi
Mewlon-210
Best suited for experienced imagers chasing detail running a permanent observatory setup.
Celestron
RASA 8
Best suited for beginners and wide-field enthusiasts running a backyard imaging setup.
Key differences
+504% focal length
Slower by 9.5 f-stops
Specifications
| Specification | Takahashi Mewlon-210 | Celestron RASA 8 |
|---|---|---|
| Optics | ||
| Type | cassegrain | SCT |
| Optical design | Dall-Kirkham | Rowe-Ackermann Schmidt |
| Aperture | 210mm | 203mm |
| Focal length | 2415mm | 400mm |
| Native f/ratio | f/11.5 | f/2.0 |
| Image circle | — | 32mm |
| Full-frame support | No | No |
| Physical | ||
| Weight | 15.5kg | 7.7kg |
Advantages of Takahashi Mewlon-210
- Tighter framing — 2415mm vs 400mm focal length
Advantages of Celestron RASA 8
- Wider field — 400mm vs 2415mm focal length
- Faster optics at f/2 vs f/11.5
- Larger image circle (32mm) — supports bigger sensors
- Lighter (7.7kg vs 15.5kg) — easier to travel with
Best for — Takahashi Mewlon-210
- Small galaxies, planetary nebulae, lunar & planetary detail
- High-resolution long-exposure work
- Faint-object imaging under dark skies
Best for — Celestron RASA 8
- Large emission nebulae and star clusters
- Fast imaging — short exposures per sub
- Faint-object imaging under dark skies
Takahashi Mewlon-210 — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 0.85° × 0.57°Scale: 0.32"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 0.56° × 0.37°Scale: 0.32"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 0.27° × 0.27°Scale: 0.32"/px
Celestron RASA 8 — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 5.16° × 3.44°Scale: 1.94"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 3.37° × 2.25°Scale: 1.94"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 1.62° × 1.62°Scale: 1.94"/px
Takahashi Mewlon-210 — recommended user
Best suited for experienced imagers chasing detail running a permanent observatory setup.
Celestron RASA 8 — recommended user
Best suited for beginners and wide-field enthusiasts running a backyard imaging setup.