telescopecomparison · 2-way
Explore Scientific ED127 FCD-100 vs Explore Scientific ED102 FCD-100
Explore Scientific
ED127 FCD-100
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
+33% focal length
+25% aperture
Slower by 0.5 f-stops
Specifications
| Specification | Explore Scientific ED127 FCD-100 | Explore Scientific ED102 FCD-100 |
|---|---|---|
| Optics | ||
| Type | Refractor | refractor |
| Optical design | Triplet APO | Apo triplet FCD-100 |
| Aperture | 127mm | 102mm |
| Focal length | 952mm | 714mm |
| Native f/ratio | f/7.5 | f/7.0 |
| Image circle | 40mm | 44mm |
| Full-frame support | Yes | Yes |
| Physical | ||
| Weight | 8.6kg | 5.5kg |
Advantages of Explore Scientific ED127 FCD-100
- Tighter framing — 952mm vs 714mm focal length
- 25% more light-gathering aperture
Advantages of Explore Scientific ED102 FCD-100
- Wider field — 714mm vs 952mm focal length
- Faster optics at f/7 vs f/7.5
- Lighter (5.5kg vs 8.6kg) — easier to travel with
Best for — Explore Scientific ED127 FCD-100
- 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
Explore Scientific ED127 FCD-100 — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 2.17° × 1.44°Scale: 0.81"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 1.41° × 0.94°Scale: 0.81"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 0.68° × 0.68°Scale: 0.81"/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
Explore Scientific ED127 FCD-100 — 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.
