cameracomparison · 2-way
ZWO ASI120MC-S vs ZWO ASI432MM
ZWO
ASI120MC-S
A strong fit for photographers stepping into astro pairing with longer focal lengths where framing is tight.
ZWO
ASI432MM
A strong fit for dedicated deep-sky imagers pairing with longer focal lengths where framing is tight.
Key differences
-66% larger sensor
Finer pixels (3.75µm vs 9µm)
-31% more resolution
Uncooled
Color vs mono
Specifications
| Specification | ZWO ASI120MC-S | ZWO ASI432MM |
|---|---|---|
| Sensor | ||
| Type | guide-camera | dedicated |
| Sensor | AR0130CS | Sony IMX432 |
| Sensor tech | CMOS | CMOS |
| Format | 1/3" | 1.1" |
| Sensor size | 4.8×3.6mm | 14.1×10.6mm |
| Diagonal | 6.0mm | 17.6mm |
| Pixel size | 3.75µm | 9.00µm |
| Resolution | 1280×960 | 1608×1104 |
| Megapixels | 1.2MP | 1.8MP |
| Color | Yes | No |
| Cooling | ||
| Cooled | No | Yes |
| Performance | ||
| Full well | 13000e⁻ | 90000e⁻ |
| Peak QE | 50% | 80% |
Advantages of ZWO ASI120MC-S
- Finer sampling at 3.75µm pixels
- One-shot color — simpler workflow
Advantages of ZWO ASI432MM
- Larger sensor (17.6mm vs 6mm diagonal) — wider field
- Larger pixels — better low-light per-pixel sensitivity
- Higher resolution (1.78MP vs 1.23MP)
- Regulated cooling for long exposures
- Mono sensor — ideal for narrowband and LRGB
Best for — ZWO ASI120MC-S
- Longer focal lengths — tighter framing on small targets
- Well-sampled deep-sky at medium focal lengths
- One-shot color — quick results, less processing
Best for — ZWO ASI432MM
- Longer focal lengths — tighter framing on small targets
- Fast, low-noise deep-sky at short focal lengths
- Long-exposure deep-sky under any sky
- Narrowband and LRGB workflows
ZWO ASI120MC-S — typical FOV & scale
- On 250mm refractor (wide)FOV: 1.10° × 0.83°Scale: 3.09"/px
- On 800mm SCT reducerFOV: 0.34° × 0.26°Scale: 0.97"/px
- On 2000mm SCT nativeFOV: 0.14° × 0.10°Scale: 0.39"/px
ZWO ASI432MM — 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 ASI120MC-S — recommended user
A strong fit for photographers stepping into astro pairing with longer focal lengths where framing is tight.
ZWO ASI432MM — recommended user
A strong fit for dedicated deep-sky imagers pairing with longer focal lengths where framing is tight.