The ZWO ASI294MM Mono is an uncooled monochrome astro camera with the Sony IMX492 sensor – ideal for lunar, planetary and deep-sky photography. Thanks to its sensitive back-illuminated sensor and flexible resolution options, this is an excellent all-rounder for astrophotographers seeking maximum sharpness.
The ASI294MM Mono uses 4.63 µm pixels, with the ability to utilize a resolution of 2.3 µm pixels via “unlocked mode”. This makes the camera suitable not only for standard imaging but also for high-res lucky imaging and solar photography.
Key Features
- Sony IMX492 monochrome sensor (11.7 MP) – 4.63 µm pixels (or 2.3 µm in unlocked mode)
- QE >75% – highly light-sensitive for short exposure times
- No active cooling – less weight, ready for immediate use
- HCG mode – read noise drops below 2 e⁻ at higher gain
- Full Well Capacity up to 66,000 e⁻ – better signal-to-noise ratio
- USB 3.0 + ST-4 interface – fast, compatible and flexible
Applications
✓ Moon & planets – extremely short exposures freeze seeing effects
✓ Deep-sky objects – stacking of short exposures without cooling
✓ Solar photography (with proper filters) – thanks to high resolution and unlock mode
✓ Live video & guiding – support for autoguiding
Specifications
| Property | Value |
|---|---|
| Sensor | Sony IMX492 (Mono CMOS) |
| Resolution | 4144 × 2822 (11.7 MP) |
| Pixel size | 4.63 µm / 2.3 µm (unlocked mode) |
| Sensor format | 19.3 × 13 mm |
| Diagonal | 23 mm |
| Bit depth | 14-bit |
| Full Well Capacity | 66,000 e⁻ |
| Read noise | 1.3 e⁻ |
| FPS | 16.3 (at full resolution) |
| Interfaces | USB 3.0, ST-4 |
| Cooling | No |
| Telescope connection | 1.25″ T2 |
| Weight | 129 g |
| Dimensions | Ø62 mm × 36 mm |
Additional Info
✓ Comes with AR-clear glass filter (transmission up to IR) – IR-cut filter optional
✓ Compact and lightweight – perfect for mobile setups or solar imaging
✓ Compatible with Windows, Mac and Linux
Please Note
An IR-cut filter is recommended for infrared-sensitive objects or use with achromats. For optimal performance with narrowband, active cooling (for example with ASI294MM Pro) is recommended.
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