cameracomparison · 2-way
ZWO ASI178MM vs ZWO ASI220MM Mini
ZWO
ASI178MM
A strong fit for photographers stepping into astro pairing with longer focal lengths where framing is tight.
ZWO
ASI220MM Mini
A strong fit for photographers stepping into astro pairing with longer focal lengths where framing is tight.
Key differences
-49% larger sensor
Finer pixels (2.4µm vs 9µm)
260% more resolution
Specifications
| Specification | ZWO ASI178MM | ZWO ASI220MM Mini |
|---|---|---|
| Sensor | ||
| Type | dedicated | guide-camera |
| Sensor | Sony IMX178 | Sony IMX432 |
| Sensor tech | CMOS | CMOS |
| Format | 1/1.8" | 1.1" |
| Sensor size | 7.4×4.9mm | 14.1×10.6mm |
| Diagonal | 8.9mm | 17.6mm |
| Pixel size | 2.40µm | 9.00µm |
| Resolution | 3096×2080 | 1608×1104 |
| Megapixels | 6.4MP | 1.8MP |
| Color | No | No |
| Cooling | ||
| Cooled | No | No |
| Performance | ||
| Full well | 15000e⁻ | 90000e⁻ |
| Peak QE | 81% | 80% |
Advantages of ZWO ASI178MM
- Finer sampling at 2.4µm pixels
- Higher resolution (6.4MP vs 1.78MP)
Advantages of ZWO ASI220MM Mini
- Larger sensor (17.6mm vs 8.9mm diagonal) — wider field
- Larger pixels — better low-light per-pixel sensitivity
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 ASI220MM Mini
- Longer focal lengths — tighter framing on small targets
- Fast, low-noise deep-sky at short focal lengths
- Narrowband and LRGB workflows
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 ASI220MM Mini — typical FOV & scale
- On 250mm refractor (wide)FOV: 3.23° × 2.42°Scale: 7.43"/px
- On 800mm SCT reducerFOV: 1.01° × 0.76°Scale: 2.32"/px
- On 2000mm SCT nativeFOV: 0.40° × 0.30°Scale: 0.93"/px
ZWO ASI178MM — recommended user
A strong fit for photographers stepping into astro pairing with longer focal lengths where framing is tight.
ZWO ASI220MM Mini — recommended user
A strong fit for photographers stepping into astro pairing with longer focal lengths where framing is tight.