telescopecomparison · 2-way
Celestron EdgeHD 8 vs Astro-Tech AT115EDT
Celestron
EdgeHD 8
Best suited for experienced imagers chasing detail running a backyard imaging setup.
Astro-Tech
AT115EDT
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
Key differences
+152% focal length
+77% aperture
Slower by 3.0 f-stops
Specifications
| Specification | Celestron EdgeHD 8 | Astro-Tech AT115EDT |
|---|---|---|
| Optics | ||
| Type | SCT | refractor |
| Optical design | Aplanatic SCT | Apo triplet FPL-53 |
| Aperture | 203mm | 115mm |
| Focal length | 2032mm | 805mm |
| Native f/ratio | f/10.0 | f/7.0 |
| Image circle | 42mm | 52mm |
| Full-frame support | Yes | Yes |
| Physical | ||
| Weight | 6.4kg | 6.6kg |
Advantages of Celestron EdgeHD 8
- Tighter framing — 2032mm vs 805mm focal length
- 77% more light-gathering aperture
Advantages of Astro-Tech AT115EDT
- Wider field — 805mm vs 2032mm focal length
- Faster optics at f/7 vs f/10
- Larger image circle (52mm) — supports bigger sensors
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 — Astro-Tech AT115EDT
- 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
Astro-Tech AT115EDT — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 2.56° × 1.71°Scale: 0.96"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 1.67° × 1.12°Scale: 0.96"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 0.80° × 0.80°Scale: 0.96"/px
Celestron EdgeHD 8 — recommended user
Best suited for experienced imagers chasing detail running a backyard imaging setup.
Astro-Tech AT115EDT — recommended user
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
