ZWO ASI990MM Pro
ZWO
ZWO ASI990MM Pro is an astronomy monochrome astronomy camera for LRGB and narrowband deep-sky imaging.
Best Current Offer
Other retailers
- $16,800.00
Astronomics (In stock)
- $16,800.00
High Point Scientific (In stock)
- $16,800.00
ZWO USA (In stock)
Specifications
Sensor
- Sensor model
- Sony IMX990 InGaAs SWIR CMOS
- Color / mono
- Monochrome
- Sensor size
- 1/2-inch SWIR sensor (6.4 x 5.12 mm)
- Megapixels
- 1.31 MP
- Resolution
- 1280 x 1024 (1.31 MP)
- Sensor diagonal
- 8.2 mm
- Sensor area
- 32.8 mm²
- Pixel size
- 5 µm
- ADC
- 12-bit
- Full well
- 127 ke
- Peak QE
- 80% at 1200 nm
Cooling
- Cooling
- Two-stage TEC cooling, ΔT 30-35 °C below ambient
Mechanical
- Interface
- USB 3.0
- Buffer
- 256 MB DDR3
- Back focus
- 17.5 mm / 6.5 mm
Astrophotography Fit
A cooled monochrome camera best used where its sensor size and workflow match the telescope and calibration plan.
ZWO ASI990MM Pro is a flagship monochrome camera aimed at LRGB and narrowband deep-sky imaging.
As a mono camera, it becomes a system only after you add a filter wheel, LRGB filters, and narrowband filters. The payoff is stronger control over signal, star color, and emission-line contrast, but the setup asks for calibration discipline.
Match the camera to the telescope before buying: sensor size controls framing, pixel size controls sampling, and cooling only pays off when you also shoot darks and flats. If the scope cannot illuminate the sensor cleanly, a smaller camera can produce better data than a bigger one.
Best paired with
- Electronic filter wheel sized for the sensor and back-focus budget
- LRGB plus Ha, OIII, and SII filters matched to the sky conditions
- Guided refractors or corrected astrographs with a clean calibration-frame library
Not recommended for
- First-time imagers who want a simple one-shot color workflow
- Rigs without budget or back focus for a filter wheel and filters
- Casual sessions where darks, flats, and repeatable gain settings are unlikely
Where To Buy
Some links on this page are affiliate links. Prices and availability are pulled automatically from each retailer and updated daily.
| Retailer | Price | Availability | View Offer |
|---|---|---|---|
| Cloud Break Optics Cloud Break Optics | $15,960.00 | In stock Updated 5/10/2026 | View Offer - $15,960.00 |
| Astronomics Astronomics | $16,800.00 | In stock Updated 5/13/2026 | View Offer - $16,800.00 |
| High Point Scientific High Point Scientific | $16,800.00 | In stock Updated 5/14/2026 | View Offer - $16,800.00 |
| ZWO USA ZWO USA | $16,800.00 | In stock Updated 5/15/2026 | View Offer - $16,800.00 |
Price History
Chronological retailer pricing with out-of-stock points shown at reduced opacity.