telescopecomparison · 2-way
Celestron C8 SCT vs Orion 8" f/3.9 Newtonian Astrograph
Orion
8" f/3.9 Newtonian Astrograph
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
Key differences
+154% focal length
Slower by 6.1 f-stops
Specifications
| Specification | Celestron C8 SCT | Orion 8" f/3.9 Newtonian Astrograph |
|---|---|---|
| Optics | ||
| Type | sct | newtonian |
| Optical design | Schmidt-Cassegrain | Newtonian astrograph |
| Aperture | 203mm | 203mm |
| Focal length | 2032mm | 800mm |
| Native f/ratio | f/10.0 | f/3.9 |
| Image circle | — | — |
| Full-frame support | No | No |
| Physical | ||
| Weight | 5.7kg | 10.5kg |
Advantages of Celestron C8 SCT
- Tighter framing — 2032mm vs 800mm focal length
- Lighter (5.7kg vs 10.5kg) — easier to travel with
Advantages of Orion 8" f/3.9 Newtonian Astrograph
- Wider field — 800mm vs 2032mm focal length
- Faster optics at f/3.9 vs f/10
Best for — Celestron C8 SCT
- Small galaxies, planetary nebulae, lunar & planetary detail
- High-resolution long-exposure work
- Faint-object imaging under dark skies
Best for — Orion 8" f/3.9 Newtonian Astrograph
- Medium-sized galaxies and planetary nebulae
- Fast imaging — short exposures per sub
- Faint-object imaging under dark skies
Celestron C8 SCT — 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
Orion 8" f/3.9 Newtonian Astrograph — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 2.58° × 1.72°Scale: 0.97"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 1.68° × 1.12°Scale: 0.97"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 0.81° × 0.81°Scale: 0.97"/px
Celestron C8 SCT — recommended user
Best suited for experienced imagers chasing detail running a backyard imaging setup.
Orion 8" f/3.9 Newtonian Astrograph — recommended user
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.