ZWO ASI461MM Pro Mono

Medium Format Imaging with a 102 MP Sensor

At the core of the ASI461MM Pro is the Sony IMX461, a 44mm x 33mm monochrome sensor that fundamentally changes how you approach wide-field astrophotography. With a resolution of 11656 x 8750, you can frame entire nebulae complexes, like the full Cygnus Loop or the Andromeda Galaxy (M31), without creating mosaics. The 3.76µm pixel size is well-suited for high-resolution refractors and reflectors, resolving fine details in galactic dust lanes and HII regions.

91% QE, 16-bit ADC, and 1.0e Read Noise

This camera is engineered for capturing faint signals with scientific precision. A peak Quantum Efficiency of 91% ensures that the vast majority of incoming photons are converted into signal, critical for narrowband imaging or capturing faint galactic cirrus. The native 16-bit ADC provides a dynamic range of 65,536 levels for smooth tonal gradations, while the read noise floor drops to an exceptionally low 1.0e at high gain, preserving delicate details in the faintest parts of your target.

• Zero Amp Glow: The circuitry is designed to produce zero amp glow, even on multi-hour exposures, resulting in perfectly clean, uniform dark frames that are simple to calibrate.
• 50.3Ke Full Well Capacity: The deep 50.3Ke full well capacity allows for long exposures in broadband without saturating bright stars in dense star fields, preserving color and detail throughout the frame.

ZWO ASI461MM Pro vs. QHY461M

Both the ZWO ASI461MM Pro and the QHY461M are built around the same 102 MP Sony IMX461 monochrome sensor and offer similar core imaging capabilities. The primary distinctions lie in the ecosystem, build, and specific features that cater to different user workflows.

• QHY461M Advantage: QHY often emphasizes robust build quality and includes features tailored for remote observatories, such as heated optical windows and advanced humidity control systems. Their driver architecture and software suite are distinct from ZWO's.
• ZWO ASI461MM Pro Advantage: The ASI461MM Pro integrates seamlessly into the ZWO ASIAIR ecosystem, offering a streamlined, mobile-first control experience that many imagers find intuitive. ZWO's established driver stability and broad third-party software support make it a plug-and-play solution for most setups. The inclusion of a 512MB DDR3 buffer ensures stable data transfer, a feature critical for preventing dropped frames with such a large data stream.

Stable Operation with TEC Cooling and 512MB Buffer

The ASI461MM Pro is built for reliable, consistent performance during long imaging sessions. The two-stage TEC cooler reduces sensor temperature by up to 35°C below ambient, dramatically lowering dark current noise for clean, long-exposure frames. An integrated 5W anti-dew heater on the protective window prevents condensation during humid nights, and the onboard 512MB DDR3 memory buffer ensures error-free data transmission to your computer, preventing dropped frames that can ruin a sub-exposure.

• Connectivity: A high-speed USB 3.0 port provides the bandwidth needed for the 102 MP sensor, while a built-in two-port USB 2.0 hub simplifies cable management by allowing you to connect a filter wheel and guide camera directly to the main camera body.
• Back Focus Options: The camera supports two native back focus distances, 17.5mm and 22.5mm, providing flexibility for connecting to various filter wheels, off-axis guiders, and other accessories in your imaging train.