cameracomparison · 2-way
ZWO ASI662MC vs ZWO ASI294MC Air
ZWO
ASI662MC
A strong fit for photographers stepping into astro pairing with longer focal lengths where framing is tight.
ZWO
ASI294MC Air
A strong fit for dedicated deep-sky imagers pairing with a broad range of focal lengths.
Key differences
-72% larger sensor
Finer pixels (2.9µm vs 4.63µm)
-82% more resolution
Uncooled
Specifications
| Specification | ZWO ASI662MC | ZWO ASI294MC Air |
|---|---|---|
| Sensor | ||
| Type | dedicated | dedicated |
| Sensor | Sony IMX662 | Sony IMX294 |
| Sensor tech | CMOS | CMOS |
| Format | 1/2.8" | 4/3" |
| Sensor size | 5.6×3.2mm | 19.1×13.0mm |
| Diagonal | 6.5mm | 23.2mm |
| Pixel size | 2.90µm | 4.63µm |
| Resolution | 1920×1080 | 4144×2822 |
| Megapixels | 2.1MP | 11.7MP |
| Color | Yes | Yes |
| Cooling | ||
| Cooled | No | Yes |
| Performance | ||
| Full well | 38000e⁻ | 66000e⁻ |
| Peak QE | 91% | 75% |
Advantages of ZWO ASI662MC
- Finer sampling at 2.9µm pixels
Advantages of ZWO ASI294MC Air
- Larger sensor (23.2mm vs 6.46mm diagonal) — wider field
- Larger pixels — better low-light per-pixel sensitivity
- Higher resolution (11.7MP vs 2.07MP)
- Regulated cooling for long exposures
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
Best for — ZWO ASI294MC Air
- Balanced field for most refractors
- Fast, low-noise deep-sky at short focal lengths
- Long-exposure deep-sky under any sky
- One-shot color — quick results, less processing
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 ASI294MC Air — typical FOV & scale
- On 250mm refractor (wide)FOV: 4.38° × 2.98°Scale: 3.82"/px
- On 800mm SCT reducerFOV: 1.37° × 0.93°Scale: 1.19"/px
- On 2000mm SCT nativeFOV: 0.55° × 0.37°Scale: 0.48"/px
ZWO ASI662MC — recommended user
A strong fit for photographers stepping into astro pairing with longer focal lengths where framing is tight.
ZWO ASI294MC Air — recommended user
A strong fit for dedicated deep-sky imagers pairing with a broad range of focal lengths.