ASI991MM Pro
ZWO
From $9,800.00
2 stores
ZWO's ASI991MM Pro is a specialized short-wave infrared (SWIR) cooled monochrome camera featuring Sony's IMX991 InGaAs sensor with exceptional sensitivity across the 0.4-1.7 micrometers spectral range. With an 80% peak quantum efficiency at 1200nm, 5-micrometer pixels, and low readout noise comparable to traditional CCD SWIR cameras, it enables high-definition imaging through clouds, fog, and even during daylight. The integrated two-stage TEC cooling system reduces sensor temperature by 30-35 degrees Celsius below ambient, suppressing dark current generation for clean long-exposure imaging ideal for SWIR astronomy, photometric measurement, optical communication, and scientific spectroscopy.
Specifications
| Sensor type | CMOS |
| Sensor pixel size | 5 |
| Sensor read noise | 21 |
| Sensor diagonal | 4.1 |
| Sensor | Sony IMX991 |
| Shutter Type | Global |
| Exposure Range | 32-2000 |
| QE Peak Wavelength | 1200 |
| DDR3 Buffer | 256 |
| Supported Operating Systems | Windows, Linux, Mac OSX |
| Maximum Frame Rate | 144 fps |
| USB Interface | USB 3.0 |
| Power Consumption (Cooling) | 21.36 W |
| Sensor Size | 3.28 mm |
| Quantum Efficiency Peak | 80% |
| Camera Diameter | 78 mm |
| Spectral Range | 0.4 |
| Recommended Power Supply | 12V @ 3A |
| Power Consumption (Non-cooling) | 1.85 W |
| Net Weight | 0.465 kg |
| ADC Bit Depth | 12 |
| Zero Amp Glow | ✓ |
| Back Focus Distance | 17.5 mm |
| Resolution | 656″ |
| Full Well Capacity | 127000 |
| Protective Window | 32mm diameter AR-coated filter, 2mm thick |
| Cooling Type | Two-stage TEC |
| Cooling Delta-T | 30 °C |
| Connection Options | 2"/1.25"/M42 x 0.75 |