telescopecomparison · 2-way
William Optics FLT 120 vs Explore Scientific ED102 FCD-100
William Optics
FLT 120
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
Explore Scientific
ED102 FCD-100
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
Key differences
+9% focal length
+18% aperture
Faster by 0.5 f-stops
Specifications
| Specification | William Optics FLT 120 | Explore Scientific ED102 FCD-100 |
|---|---|---|
| Optics | ||
| Type | Refractor | refractor |
| Optical design | Triplet APO | Apo triplet FCD-100 |
| Aperture | 120mm | 102mm |
| Focal length | 780mm | 714mm |
| Native f/ratio | f/6.5 | f/7.0 |
| Image circle | 44mm | 44mm |
| Full-frame support | Yes | Yes |
| Physical | ||
| Weight | 7.7kg | 5.5kg |
Advantages of William Optics FLT 120
- 18% more light-gathering aperture
- Faster optics at f/6.5 vs f/7
Advantages of Explore Scientific ED102 FCD-100
- Lighter (5.5kg vs 7.7kg) — easier to travel with
Best for — William Optics FLT 120
- Medium-sized galaxies and planetary nebulae
- Full-frame astro cameras and DSLRs
Best for — Explore Scientific ED102 FCD-100
- Medium-sized galaxies and planetary nebulae
- Full-frame astro cameras and DSLRs
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
Explore Scientific ED102 FCD-100 — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 2.89° × 1.93°Scale: 1.09"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 1.89° × 1.26°Scale: 1.09"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 0.91° × 0.91°Scale: 1.09"/px
William Optics FLT 120 — recommended user
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
Explore Scientific ED102 FCD-100 — recommended user
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
