ZWO ASI461MM Pro Camera

ZWO ASI461MM Pro Monochrome Camera – High-Resolution, Low-Noise Imaging for Serious Astrophotographers

The ZWO ASI461MM Pro is a state-of-the-art monochrome CMOS camera designed for astrophotographers and researchers who demand the best in imaging performance. With a massive 100-megapixel resolution, a large full-frame sensor, incredibly low read noise, and deep cooling capabilities, this camera is built to deliver uncompromising results. Whether you are capturing wide-field deep-sky objects, high-resolution planetary images, or conducting scientific observations, the ASI461MM Pro provides the precision, sensitivity, and reliability required for professional-grade imaging.

Expansive Full-Frame Sensor for Large-Scale Imaging

At the heart of the ASI461MM Pro is the Sony IMX461 monochrome sensor, a cutting-edge, back-illuminated CMOS chip with a physical size of 44mm x 33mm. The full-frame format provides an expansive field of view, making it an excellent choice for astrophotographers who want to capture large nebulae, sprawling star fields, and extensive galactic structures without requiring complex mosaics. This sensor size also allows the camera to take full advantage of high-quality optics, reducing the effects of cropping and preserving the true resolution of an image.

Unmatched Sensitivity and Low Read Noise

One of the standout features of the ASI461MM Pro is its ability to capture faint details with exceptional clarity. The sensor boasts a remarkably high quantum efficiency, meaning it converts a greater percentage of incoming photons into useful signal, minimizing loss due to sensor inefficiencies. Combined with an ultra-low read noise that can be as low as 1.0 e-, this camera excels in revealing fine structures in deep-sky objects, even when using narrowband filters.

The high sensitivity and low noise characteristics make it possible to detect the delicate wisps of a supernova remnant, the intricate details of a planetary nebula, or the subtle gradients in interstellar dust clouds, all with less time spent on post-processing noise reduction.

High Dynamic Range for Enhanced Image Depth

With a dynamic range exceeding 14 stops, the ASI461MM Pro provides smooth transitions between bright and dark areas of an image. This extended range allows astrophotographers to capture details in both the brightest cores of nebulae and the faintest wisps of surrounding gas without losing contrast. The ability to maintain subtle details across a wide exposure range is essential for imaging high-contrast targets like the Orion Nebula, where the core is exceptionally bright while the surrounding dust and gas structures are faint.

Advanced Two-Stage Cooling System for Ultra-Low Thermal Noise

Thermal noise is one of the greatest challenges in long-exposure astrophotography, but the ASI461MM Pro eliminates this concern with its two-stage thermoelectric cooling system. This system is capable of reducing the sensor temperature by up to 35 degrees Celsius below ambient, significantly lowering dark current and improving the signal-to-noise ratio. This means you can take ultra-long exposures without worrying about thermal interference, making it easier to capture faint objects such as distant galaxies and dim nebulae.

A regulated cooling system also ensures consistency from one imaging session to the next, a crucial factor for those conducting scientific research, photometry, or professional astrophotography projects.

16-Bit ADC for Smooth and Natural Image Gradations

Unlike lower-bit-depth cameras that struggle with color transitions and contrast depth, the ASI461MM Pro features a true 16-bit analog-to-digital converter. With 65,536 levels of grayscale, this high-bit-depth sensor ensures seamless tonal transitions and precise color balance in LRGB imaging. Even the most delicate star colors and faint emission lines are accurately recorded, producing images with a natural and lifelike appearance.

Monochrome Imaging for Maximum Detail and Flexibility

Monochrome cameras are the gold standard for serious astrophotographers due to their superior light sensitivity and flexibility in filter-based imaging. The ASI461MM Pro captures more detail compared to one-shot color cameras because each pixel collects pure luminance data without the interference of a Bayer matrix. This allows for the use of specialized filters, such as hydrogen-alpha, oxygen-III, and sulfur-II narrowband filters, to isolate specific wavelengths of light.

By imaging in narrowband, astrophotographers can reveal structures hidden in broadband light, such as ionized gas clouds and star-forming regions, producing breathtaking high-contrast images even under light-polluted skies.

High-Speed USB 3.0 Interface with DDR3 Buffer

The ASI461MM Pro is equipped with a USB 3.0 interface that allows for high-speed data transfer, ensuring quick and efficient image acquisition. This is particularly beneficial for planetary imaging, where high frame rates are needed to freeze atmospheric turbulence and capture crisp details of planets and the Moon.

To prevent frame drops and amp glow, the camera includes a 256MB DDR3 memory buffer, which optimizes data transfer and ensures smooth performance, even when working with large full-frame image files.

Dew Heater to Prevent Condensation

Humidity and temperature fluctuations can cause condensation on the camera sensor window, especially during long imaging sessions in damp environments. To combat this, the ASI461MM Pro includes an integrated dew heater that gently warms the optical window to prevent moisture buildup. This small but important feature ensures clear, unobstructed imaging no matter the conditions.

Durable and Thoughtfully Designed for Serious Astrophotographers

The ASI461MM Pro is built with a CNC-machined aluminum body, ensuring a durable and lightweight design. The body is designed to effectively dissipate heat, further contributing to stable cooling performance. The camera also features standard M54 and M42 thread adapters, making it easy to integrate with a variety of telescopes and imaging accessories.

Whether you are an advanced amateur, a dedicated astrophotographer, or a professional researcher, the ASI461MM Pro is built to meet the highest standards of performance and reliability.

Key Features

• Large-format Sony IMX461 monochrome sensor with a 44mm x 33mm active imaging area
• 100-megapixel resolution for highly detailed and expansive images
• Back-illuminated sensor technology for maximum light sensitivity
• Extremely low read noise, as low as 1.0 e-, for capturing faint details
• Over 14 stops of dynamic range for enhanced image depth and contrast
• Two-stage TEC cooling system capable of reducing sensor temperature by up to 35 degrees Celsius below ambient
• 16-bit ADC for smooth tonal gradations and precise color representation
• USB 3.0 high-speed data transfer with 256MB DDR3 memory buffer to prevent frame drops
• Integrated dew heater to prevent condensation on the optical window
• Monochrome sensor for maximum detail and narrowband imaging flexibility

Elevate Your Astrophotography with the ASI461MM Pro

The ZWO ASI461MM Pro is an outstanding choice for those looking to push the boundaries of their astrophotography. With its high-resolution sensor, unmatched sensitivity, deep cooling, and versatile monochrome format, this camera delivers professional-level performance for deep-sky, planetary, and scientific imaging. Whether you are imaging vast nebulae, studying fine galactic structures, or capturing planetary detail, the ASI461MM Pro provides the tools you need to achieve stunning results.