cameracomparison · 2-way
ZWO ASI178MM vs ZWO ASI662MC
ZWO
ASI178MM
A strong fit for photographers stepping into astro pairing with longer focal lengths where framing is tight.
ZWO
ASI662MC
A strong fit for photographers stepping into astro pairing with longer focal lengths where framing is tight.
Key differences
38% larger sensor
Finer pixels (2.4µm vs 2.9µm)
209% more resolution
Mono vs color
Specifications
| Specification | ZWO ASI178MM | ZWO ASI662MC |
|---|---|---|
| Sensor | ||
| Type | dedicated | dedicated |
| Sensor | Sony IMX178 | Sony IMX662 |
| Sensor tech | CMOS | CMOS |
| Format | 1/1.8" | 1/2.8" |
| Sensor size | 7.4×4.9mm | 5.6×3.2mm |
| Diagonal | 8.9mm | 6.5mm |
| Pixel size | 2.40µm | 2.90µm |
| Resolution | 3096×2080 | 1920×1080 |
| Megapixels | 6.4MP | 2.1MP |
| Color | No | Yes |
| Cooling | ||
| Cooled | No | No |
| Performance | ||
| Full well | 15000e⁻ | 38000e⁻ |
| Peak QE | 81% | 91% |
Advantages of ZWO ASI178MM
- Larger sensor (8.9mm vs 6.46mm diagonal) — wider field
- Finer sampling at 2.4µm pixels
- Higher resolution (6.4MP vs 2.07MP)
- Mono sensor — ideal for narrowband and LRGB
Advantages of ZWO ASI662MC
- Larger pixels — better low-light per-pixel sensitivity
- One-shot color — simpler workflow
Best for — ZWO ASI178MM
- Longer focal lengths — tighter framing on small targets
- Planetary and lunar high-resolution imaging
- Narrowband and LRGB workflows
Best for — ZWO ASI662MC
- Longer focal lengths — tighter framing on small targets
- Well-sampled deep-sky at medium focal lengths
- One-shot color — quick results, less processing
ZWO ASI178MM — typical FOV & scale
- On 250mm refractor (wide)FOV: 1.70° × 1.12°Scale: 1.98"/px
- On 800mm SCT reducerFOV: 0.53° × 0.35°Scale: 0.62"/px
- On 2000mm SCT nativeFOV: 0.21° × 0.14°Scale: 0.25"/px
ZWO ASI662MC — typical FOV & scale
- On 250mm refractor (wide)FOV: 1.28° × 0.73°Scale: 2.39"/px
- On 800mm SCT reducerFOV: 0.40° × 0.23°Scale: 0.75"/px
- On 2000mm SCT nativeFOV: 0.16° × 0.09°Scale: 0.30"/px
ZWO ASI178MM — recommended user
A strong fit for photographers stepping into astro pairing with longer focal lengths where framing is tight.
ZWO ASI662MC — recommended user
A strong fit for photographers stepping into astro pairing with longer focal lengths where framing is tight.