cameracomparison · 2-way
ZWO ASI533MM Pro vs ZWO ASI294MC Air
ZWO
ASI533MM Pro
A strong fit for dedicated deep-sky imagers 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
-31% larger sensor
Finer pixels (3.76µm vs 4.63µm)
-23% more resolution
Mono vs color
Specifications
| Specification | ZWO ASI533MM Pro | ZWO ASI294MC Air |
|---|---|---|
| Sensor | ||
| Type | Dedicated Cooled | dedicated |
| Sensor | Sony IMX533 | Sony IMX294 |
| Sensor tech | CMOS | CMOS |
| Format | 1-inch square | 4/3" |
| Sensor size | 11.3×11.3mm | 19.1×13.0mm |
| Diagonal | 16.0mm | 23.2mm |
| Pixel size | 3.76µm | 4.63µm |
| Resolution | 3008×3008 | 4144×2822 |
| Megapixels | 9.0MP | 11.7MP |
| Color | No | Yes |
| Cooling | ||
| Cooled | Yes | Yes |
| Performance | ||
| Full well | 50000e⁻ | 66000e⁻ |
| Peak QE | 91% | 75% |
Advantages of ZWO ASI533MM Pro
- Finer sampling at 3.76µm pixels
- Mono sensor — ideal for narrowband and LRGB
Advantages of ZWO ASI294MC Air
- Larger sensor (23.2mm vs 16mm diagonal) — wider field
- Larger pixels — better low-light per-pixel sensitivity
- Higher resolution (11.7MP vs 9MP)
- One-shot color — simpler workflow
Best for — ZWO ASI533MM Pro
- Longer focal lengths — tighter framing on small targets
- Well-sampled deep-sky at medium focal lengths
- Long-exposure deep-sky under any sky
- Narrowband and LRGB workflows
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 ASI533MM Pro — typical FOV & scale
- On 250mm refractor (wide)FOV: 2.59° × 2.59°Scale: 3.10"/px
- On 800mm SCT reducerFOV: 0.81° × 0.81°Scale: 0.97"/px
- On 2000mm SCT nativeFOV: 0.32° × 0.32°Scale: 0.39"/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 ASI533MM Pro — recommended user
A strong fit for dedicated deep-sky imagers 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.