telescopecomparison · 2-way
Astro-Physics 155mm f/6 StarFire CS vs ZWO FF131 APO
Astro-Physics
155mm f/6 StarFire CS
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
ZWO
FF131 APO
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
Key differences
-5% focal length
+18% aperture
Faster by 1.5 f-stops
Specifications
| Specification | Astro-Physics 155mm f/6 StarFire CS | ZWO FF131 APO |
|---|---|---|
| Optics | ||
| Type | refractor | refractor |
| Optical design | Christen Superachromat (4-element) | Apo quadruplet ED |
| Aperture | 155mm | 131mm |
| Focal length | 930mm | 983mm |
| Native f/ratio | f/6.0 | f/7.5 |
| Image circle | 64mm | 44mm |
| Full-frame support | Yes | Yes |
| Physical | ||
| Weight | 10.9kg | 7.9kg |
Advantages of Astro-Physics 155mm f/6 StarFire CS
- 18% more light-gathering aperture
- Faster optics at f/6 vs f/7.5
- Larger image circle (64mm) — supports bigger sensors
Advantages of ZWO FF131 APO
- Lighter (7.9kg vs 10.9kg) — easier to travel with
Best for — Astro-Physics 155mm f/6 StarFire CS
- Medium-sized galaxies and planetary nebulae
- Full-frame astro cameras and DSLRs
Best for — ZWO FF131 APO
- Medium-sized galaxies and planetary nebulae
- Full-frame astro cameras and DSLRs
Astro-Physics 155mm f/6 StarFire CS — typical FOV & scale
- With Full-frame (36×24mm, 3.76µm)FOV: 2.22° × 1.48°Scale: 0.83"/px
- With APS-C (23.5×15.7mm, 3.76µm)FOV: 1.45° × 0.97°Scale: 0.83"/px
- With IMX533 square (11.3×11.3mm, 3.76µm)FOV: 0.70° × 0.70°Scale: 0.83"/px
ZWO FF131 APO — 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
Astro-Physics 155mm f/6 StarFire CS — recommended user
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
ZWO FF131 APO — recommended user
Best suited for intermediate imagers building a versatile kit running a backyard imaging setup.
