telescopecomparison · 2-way
Celestron EdgeHD 8 vs William Optics FLT 120
Celestron
EdgeHD 8
Best suited for experienced imagers chasing detail running a backyard imaging setup.
William Optics
FLT 120
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
Key differences
+161% focal length
+69% aperture
Slower by 3.5 f-stops
Specifications
| Specification | Celestron EdgeHD 8 | William Optics FLT 120 |
|---|---|---|
| Optics | ||
| Type | SCT | Refractor |
| Optical design | Aplanatic SCT | Triplet APO |
| Aperture | 203mm | 120mm |
| Focal length | 2032mm | 780mm |
| Native f/ratio | f/10.0 | f/6.5 |
| Image circle | 42mm | 44mm |
| Full-frame support | Yes | Yes |
| Physical | ||
| Weight | 6.4kg | 7.7kg |
Advantages of Celestron EdgeHD 8
- Tighter framing — 2032mm vs 780mm focal length
- 69% more light-gathering aperture
- Lighter (6.4kg vs 7.7kg) — easier to travel with
Advantages of William Optics FLT 120
- Wider field — 780mm vs 2032mm focal length
- Faster optics at f/6.5 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 — William Optics FLT 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
William Optics FLT 120 — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 2.64° × 1.76°Scale: 0.99"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 1.73° × 1.15°Scale: 0.99"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 0.83° × 0.83°Scale: 0.99"/px
Celestron EdgeHD 8 — recommended user
Best suited for experienced imagers chasing detail running a backyard imaging setup.
William Optics FLT 120 — recommended user
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
