ZWO ASI990MM Pro

Name: ZWO ASI990MM Pro
Brand: ZWO

ZWO

ZWO ASI990MM Pro is an astronomy monochrome astronomy camera for LRGB and narrowband deep-sky imaging.

camera $$$$

Best Current Offer

Cloud Break Optics

In stock

$15,960.00

Other retailers

Astronomics (In stock)
$16,800.00
High Point Scientific (In stock)
$16,800.00
ZWO USA (In stock)
$16,800.00

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 11/4/2026	View Offer - $15,960.00
Astronomics Astronomics	$16,800.00	In stock Updated 11/4/2026	View Offer - $16,800.00
High Point Scientific High Point Scientific	$16,800.00	In stock Updated 11/4/2026	View Offer - $16,800.00
ZWO USA ZWO USA	$16,800.00	In stock Updated 11/4/2026	View Offer - $16,800.00

Price History

Chronological retailer pricing with out-of-stock points shown at reduced opacity.

Astronomics Cloud Break Optics High Point Scientific ZWO USA