cameracomparison · 2-way
ZWO ASI178MM vs ZWO ASI2600MM Duo
ZWO
ASI178MM
A strong fit for photographers stepping into astro pairing with longer focal lengths where framing is tight.
ZWO
ASI2600MM Duo
A strong fit for dedicated deep-sky imagers pairing with a broad range of focal lengths.
Key differences
-69% larger sensor
Finer pixels (2.4µm vs 3.76µm)
-75% more resolution
Uncooled
Specifications
| Specification | ZWO ASI178MM | ZWO ASI2600MM Duo |
|---|---|---|
| Sensor | ||
| Type | dedicated | dedicated |
| Sensor | Sony IMX178 | Sony IMX571 + IMX533 |
| Sensor tech | CMOS | CMOS |
| Format | 1/1.8" | APS-C |
| Sensor size | 7.4×4.9mm | 23.5×15.7mm |
| Diagonal | 8.9mm | 28.3mm |
| Pixel size | 2.40µm | 3.76µm |
| Resolution | 3096×2080 | 6248×4176 |
| Megapixels | 6.4MP | 26.1MP |
| Color | No | No |
| Cooling | ||
| Cooled | No | Yes |
| Performance | ||
| Full well | 15000e⁻ | 50000e⁻ |
| Peak QE | 81% | 80% |
Advantages of ZWO ASI178MM
- Finer sampling at 2.4µm pixels
Advantages of ZWO ASI2600MM Duo
- Larger sensor (28.3mm vs 8.9mm diagonal) — wider field
- Larger pixels — better low-light per-pixel sensitivity
- Higher resolution (26.1MP vs 6.4MP)
- Regulated cooling for long exposures
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 ASI2600MM Duo
- Balanced field for most refractors
- Well-sampled deep-sky at medium focal lengths
- Long-exposure deep-sky under any sky
- 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 ASI2600MM Duo — typical FOV & scale
- On 250mm refractor (wide)FOV: 5.39° × 3.60°Scale: 3.10"/px
- On 800mm SCT reducerFOV: 1.68° × 1.12°Scale: 0.97"/px
- On 2000mm SCT nativeFOV: 0.67° × 0.45°Scale: 0.39"/px
ZWO ASI178MM — recommended user
A strong fit for photographers stepping into astro pairing with longer focal lengths where framing is tight.
ZWO ASI2600MM Duo — recommended user
A strong fit for dedicated deep-sky imagers pairing with a broad range of focal lengths.