The ASI662MM and ASI662MC planetary cameras from ZWO are part of a new generation of affordable, high-performance astronomy cameras designed for capturing stunning images of celestial objects. Both cameras use the Sony IMX662 rolling shutter CMOS sensor, known for its excellent sensitivity, low read noise, and fast frame rates. They are ideal for planetary imaging, lunar and solar photography, and even for some entry-level deep sky work under the right conditions. With their compact design and advanced hardware features, the ASI662MM (monochrome) and ASI662MC (color) offer amateur astronomers an accessible path to high-quality astrophotography without breaking the bank.
At the heart of both the ASI662MM and ASI662MC is the Sony IMX662 sensor. This is a 1/2.8-inch format CMOS chip with a 2.9-micron pixel size and a total resolution of 2.07 megapixels (1920×1080). This resolution is optimized for planetary work, providing a fine balance between image scale and field of view when paired with typical planetary telescopes like SCTs, Maksutovs, or refractors. The relatively small pixel size allows these cameras to take full advantage of high-magnification setups, capturing fine planetary details when atmospheric conditions are favorable.
One of the standout features of the ASI662MM and MC is their high frame rate. In high-speed mode, these cameras can achieve up to 107.6 frames per second at full resolution. This high speed is crucial for planetary imaging, where stacking thousands of frames is the key to overcoming atmospheric turbulence and extracting sharp, detailed images. To ensure smooth and reliable data transfer, both models include a USB 3.0 interface and an onboard 256MB DDR3 memory buffer, which prevents dropped frames and maintains stable performance even during long captures.
A major concern in astrophotography is read noise—the electronic noise introduced during image readout. The ASI662 series excels here, with extremely low read noise thanks to its advanced sensor design and built-in High Conversion Gain (HCG) mode. When the camera’s gain is set to 252, the HCG mode automatically activates, reducing read noise while preserving a high dynamic range of up to 12 bits. This combination allows astronomers to image both bright and faint features in a single capture, making it easier to process images with rich detail across the dynamic range.
Another benefit of the ASI662MM and MC cameras is their large full well capacity. This characteristic makes them resistant to overexposure, allowing longer exposures when necessary without blowing out highlights. This is particularly valuable for lunar and solar imaging, where there are bright regions alongside more delicate features. Additionally, the cameras feature a no amp glow design, meaning there is no unwanted background glow even at high gain and long exposures. This hardware-level solution simplifies post-processing and ensures cleaner, more uniform images.
Quantum Efficiency (QE) is a key performance measure in any camera, representing how effectively it converts incoming photons into electrical signals. Both the ASI662MM and MC achieve a peak QE of 91%, which is remarkably high for a camera in this price range. This efficiency is especially advantageous in low-light conditions, such as when imaging faint planetary details, deep sky objects under narrowband filters (for the mono version), or dim lunar and solar features. The high QE also helps to keep exposure times short, reducing the impact of tracking errors or seeing conditions.
The ASI662MM is the monochrome version of the camera, which offers maximum sensitivity and flexibility, especially when combined with filters for LRGB or narrowband imaging. It is the preferred choice for serious planetary imagers who want to capture the finest details and have control over every color channel. The ASI662MC, on the other hand, is the one-shot color version, making it more convenient for beginners or those looking for quick imaging sessions without the need for filter wheels or additional accessories. Both versions deliver impressive results, but the mono model holds a slight performance edge due to its lack of a Bayer matrix.
The ASI662MM and MC cameras are designed for easy integration into a wide range of astrophotography setups. They feature standard 1.25-inch nosepieces for compatibility with most telescope focusers, as well as M42 threads for secure attachment. The mechanical design is compact and lightweight, making it easy to balance on smaller mounts. Both cameras also offer flexible connectivity through USB 3.0, ensuring fast data transfer to computers and minimizing capture delays.
These cameras shine brightest in planetary imaging, where their speed, sensitivity, and resolution allow users to capture detailed views of Jupiter’s cloud bands, Saturn’s rings, or the lunar surface. They are also excellent tools for solar imaging (with proper filtration) and can serve as capable guide cameras for deep sky astrophotography setups. While not designed primarily for long-exposure deep sky imaging, the ASI662MM, with its mono sensor, can be used effectively for certain small targets or as an experimental tool for narrowband imaging.
One of the most appealing aspects of the ASI662MM and MC is their price. With the ASI662MC starting at $179 and the ASI662MM priced up to $307 depending on configuration, these cameras provide exceptional value for money. They offer features that were once only available in much more expensive cameras, opening up high-quality planetary imaging to a broader range of amateur astronomers. Combined with ZWO’s standard two-year warranty and worldwide free shipping on orders over $199, they make an attractive investment for those looking to expand their astrophotography toolkit.
ZWO backs the ASI662MM and MC cameras with dedicated service, including one-on-one support and a two-year warranty. The company is known for its strong community presence and offers a variety of online resources, including user forums, product guides, and customer support channels. This commitment to customer care ensures that users can get help with setup, troubleshooting, and optimization, making the imaging experience smoother and more enjoyable.
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