ZWO ASI585MM-P Mono

4K Resolution from the 8.29 MP Sony IMX585 Sensor

At the core of the ASI585MM Pro is a 1/1.2" format Sony CMOS sensor with a 3840 x 2160 pixel array. The 2.9µm pixel size is small enough to sample targets critically on short-focal-length refractors while providing the resolution needed for detailed lunar and planetary imaging with larger instruments. As a monochrome camera, it directs all incoming light to each pixel without the light loss inherent to a color filter array, maximizing its sensitivity to faint structures.

91% Peak QE and Zero Amp Glow for Deep-Sky Imaging

With a peak QE of 91%, the ASI585MM Pro converts the vast majority of photons into usable signal, a critical factor for imaging faint nebulae and galaxies. This high sensitivity is complemented by ZWO's zero amplifier glow circuitry, which eliminates a common source of noise and gradients in long-exposure frames. The result is cleaner raw data that requires less aggressive processing to reveal faint details against a dark sky background.

TEC Cooling and 512MB DDR3 Buffer

Two-stage thermoelectric cooling (TEC) actively reduces the sensor's temperature, which is the primary defense against thermal noise during long exposures required for deep-sky astrophotography. For high-speed planetary work, the onboard 512MB DDR3 memory buffer ensures stable, high-speed data transfer to your computer, even at the maximum 47 FPS rate. This combination makes the camera a true hybrid, capable of producing low-noise, single-frame deep-sky images and thousands of high-speed subframes for planetary stacking.

ASI585MM Pro vs. ASI585MC Pro: Monochrome Signal Advantage

Compared to its one-shot-color sibling, the ASI585MC Pro, the ASI585MM Pro holds a significant advantage in raw sensitivity and resolution. The primary trade-off is workflow complexity, as the monochrome camera requires LRGB or narrowband filters and a filter wheel to produce a color image.

• ASI585MM Pro (Mono): Captures the highest possible detail and signal by using every one of its 8.29 million pixels for luminance data. It is the superior choice for narrowband imaging of emission nebulae or for imagers seeking maximum resolution on any target.
• ASI585MC Pro (Color): Delivers a full-color image in a single exposure, simplifying the capture process. This convenience comes at the cost of reduced signal per pixel, as the Bayer matrix filters light, lowering the effective quantum efficiency compared to its mono counterpart.

Native M42 Interface and Connection Flexibility

The camera body features a standard M42x0.75 female thread for direct connection to most astronomical accessories. ZWO includes a comprehensive set of adapters and extenders, including M42-M48 and 1.25" nosepieces, to facilitate correct spacing with filter wheels, off-axis guiders, and focal reducers. The built-in USB 2.0 hub provides two extra ports for managing accessories like a guide camera or electronic focuser, reducing cable clutter from the mount to the computer.