telescopecomparison · 2-way
Orion EON 130mm ED Triplet vs Orion 8" f/3.9 Newtonian Astrograph
Orion
EON 130mm ED Triplet
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
Orion
8" f/3.9 Newtonian Astrograph
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
Key differences
+14% focal length
-36% aperture
Slower by 3.1 f-stops
Specifications
| Specification | Orion EON 130mm ED Triplet | Orion 8" f/3.9 Newtonian Astrograph |
|---|---|---|
| Optics | ||
| Type | refractor | newtonian |
| Optical design | Apo triplet FPL-53 | Newtonian astrograph |
| Aperture | 130mm | 203mm |
| Focal length | 910mm | 800mm |
| Native f/ratio | f/7.0 | f/3.9 |
| Image circle | 44mm | — |
| Full-frame support | Yes | No |
| Physical | ||
| Weight | 7.7kg | 10.5kg |
Advantages of Orion EON 130mm ED Triplet
- Tighter framing — 910mm vs 800mm focal length
- Larger image circle (44mm) — supports bigger sensors
- Lighter (7.7kg vs 10.5kg) — easier to travel with
Advantages of Orion 8" f/3.9 Newtonian Astrograph
- Wider field — 800mm vs 910mm focal length
- 56% more light-gathering aperture
- Faster optics at f/3.9 vs f/7
Best for — Orion EON 130mm ED Triplet
- Medium-sized galaxies and planetary nebulae
- Full-frame astro cameras and DSLRs
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
Orion EON 130mm ED Triplet — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 2.27° × 1.51°Scale: 0.85"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 1.48° × 0.99°Scale: 0.85"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 0.71° × 0.71°Scale: 0.85"/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
Orion EON 130mm ED Triplet — recommended user
Best suited for intermediate imagers building a versatile kit 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.