ASI662MC vs ASI294MC Pro: Color Camera for Planets or Deep Sky
By Cloud Break Optics | Published: 2026-11-01
Category: Comparisons
Compare the ASI662MC USB3.0 color camera and the ASI294MC Pro cooled camera on sensor size, cooling, and pixel scale to decide which fits planetary or deep-sky imaging.
Quick answer
Choose the ASI662MC USB3.0 Color Astronomy Camera for planetary and lunar imaging, where its small, fast sensor suits high-magnification video. Choose the ASI294MC Pro (color) for deep-sky work, where its larger Type 4/3 sensor and cooled body support longer exposures and fainter targets.
Sensor size and pixel scale set the real split
The ASI294MC Pro uses a Type 4/3 sensor with a 23.2 mm diagonal and 4.63 μm pixels, giving a wide field and fine sampling on most deep-sky scopes. The ASI662MC's sensor dimensions are not supplied in the catalog, so you cannot compare its field of view or pixel scale from the listing alone; check the manufacturer's spec sheet before matching it to a particular focal length.
In practice, the larger ASI294MC Pro sensor captures extended nebulae and galaxies without mosaics, while a small planetary sensor like the ASI662MC concentrates pixels on a tiny disk. That is a trade-off in coverage, not a quality ranking.
Cooling changes what you can shoot
The ASI294MC Pro is a cooled camera, which matters for long deep-sky exposures where sensor temperature drifts and dark current rises. The ASI662MC is listed without cooling, so it is better suited to short, bright-target captures such as planets and the Moon, where thermal noise has less time to accumulate.
If your nights are warm or you plan multi-minute sub-exposures, the cooled body is the more practical choice. For high-frame-rate planetary video, cooling adds bulk and cost without solving the main problem.
Interface and price context
The ASI662MC connects over USB 3.0, which supports the fast frame rates planetary imaging needs. The ASI294MC Pro's interface is not stated in the supplied facts, so confirm it before building a cable plan. At catalog prices of USD 131.34 for the ASI662MC and USD 729.27 for the ASI294MC Pro, the gap reflects the larger sensor and cooled body, not a difference in brand or software ecosystem.
Trade-offs to weigh before you buy
- Field of view vs pixel concentration: The ASI294MC Pro's 23.2 mm diagonal frames extended objects; the ASI662MC's smaller sensor puts more pixels on a planet but covers less sky. Match the sensor to your target size, not to the spec sheet alone. Measure your intended target's angular size against your scope's focal length before deciding.
- Cooling vs simplicity: The ASI294MC Pro's cooled body controls thermal noise for long exposures; the ASI662MC's uncooled design keeps the camera light and simple for short planetary videos. If you image in warm conditions or use sub-exposures over a few minutes, prioritize cooling.
- Budget vs capability: At USD 131.34 the ASI662MC is a low-cost entry to color planetary imaging; at USD 729.27 the ASI294MC Pro costs more because of its larger sensor and cooling. Neither price includes a guide scope, mount, or filters. Budget for the whole imaging train, not just the camera body.
Product facts
- ASI294MC Pro (color): Type 4/3 sensor with a 23.2 mm diagonal and approximately 11.71M effective pixels. The wide field captures large deep-sky targets in one frame instead of a mosaic.
ASI294MC Pro (color) - ASI662MC USB3.0 Color Astronomy Camera: USB 3.0 interface in the Standard configuration under SKU ZWO-ASI662MC. Fast data transfer supports the high-frame-rate video that planetary imaging relies on.
ASI662MC USB3.0 Color Astronomy Camera
Which camera fits your setup
Best for
- Planetary and lunar imagers who want high-frame-rate color video
- Beginners adding a first dedicated astronomy camera at low cost
Not for
- Deep-sky imagers shooting faint nebulae or galaxies who need a wide field and cooling
- Users who need a large sensor for framing extended objects in one shot
