telescopecomparison · 2-way
SharpStar 61EDPH III vs SharpStar 140PH
SharpStar
61EDPH III
Best suited for beginners and wide-field enthusiasts running a portable travel rig.
SharpStar
140PH
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
Key differences
-66% focal length
-56% aperture
Faster by 1.5 f-stops
Specifications
| Specification | SharpStar 61EDPH III | SharpStar 140PH |
|---|---|---|
| Optics | ||
| Type | Refractor | refractor |
| Optical design | Doublet APO | Apo triplet FPL-53 |
| Aperture | 61mm | 140mm |
| Focal length | 335mm | 980mm |
| Native f/ratio | f/5.5 | f/7.0 |
| Image circle | 32mm | 52mm |
| Full-frame support | No | Yes |
| Physical | ||
| Weight | 2.4kg | 9.5kg |
Advantages of SharpStar 61EDPH III
- Wider field — 335mm vs 980mm focal length
- Faster optics at f/5.5 vs f/7
- Lighter (2.4kg vs 9.5kg) — easier to travel with
Advantages of SharpStar 140PH
- Tighter framing — 980mm vs 335mm focal length
- 130% more light-gathering aperture
- Larger image circle (52mm) — supports bigger sensors
Best for — SharpStar 61EDPH III
- Wide-field nebulae and Milky Way regions
Best for — SharpStar 140PH
- Medium-sized galaxies and planetary nebulae
- Full-frame astro cameras and DSLRs
SharpStar 61EDPH III — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 6.16° × 4.11°Scale: 2.32"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 4.02° × 2.69°Scale: 2.32"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 1.93° × 1.93°Scale: 2.32"/px
SharpStar 140PH — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 2.10° × 1.40°Scale: 0.79"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 1.37° × 0.92°Scale: 0.79"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 0.66° × 0.66°Scale: 0.79"/px
SharpStar 61EDPH III — recommended user
Best suited for beginners and wide-field enthusiasts running a portable travel rig.
SharpStar 140PH — recommended user
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.