ZWO ASI 678 MM Mono Astro Camera – uncooled astrophotography
The ZWO ASI 678 MM Mono Astro Camera is a monochrome planetary camera with small pixels and very low read noise. It is a good choice whenever high frame rates, a steady image and straightforward operation are more important than active cooling.
What is this camera suited for?
With its Sony IMX678 / ASI 678, it is designed for Moon, planets, infrared imaging and imaging with color filters. The uncooled design keeps the camera compact and quick to set up. For long deep-sky exposures, a cooled camera is usually preferable; for the Moon, planets, guiding and many EAA applications, this model is especially practical.
Key features
| Series / sensor | Sony IMX678 / ASI 678 |
|---|---|
| Camera type | Mono |
| Cooling | uncooled, passive heat dissipation |
| Typical applications | Moon, planets, infrared imaging and imaging with color filters |
| Connection | USB camera with autoguider/ST4 support depending on model |
The camera works with the relevant ZWO software and common capture applications. For solar imaging, use it only with a suitable solar filter mounted in front of the telescope.
CMOS sensor in detail
The ASI 678 MM is the monochrome version of the high-resolution IMX678 camera. Without a color filter array, it uses incoming light particularly efficiently and offers flexibility for red, green, blue, H-alpha or IR imaging. With 2 µm pixels and a high frame rate, it is especially useful for lunar, solar and planetary work.
Sensor specifications
| Sensor | Sony IMX678 monochrome |
|---|---|
| Sensor format | 1/1.8 inch; 7.68 × 4,32 mm |
| Resolution | 3840 × 2160 pixels / 8.29 MP |
| Pixel size | 2 µm |
| ADC / read noise | 12 bit / from approx. 0.6 e⁻ |
| Quantum efficiency | approx. 83 % |
| Full-well capacity | approx. 11.27 ke⁻ |
| Frame rate | up to 47,5 fps |
| Exposure time | 32 µs up to 2000 s |
| Connection | USB 3.0 |
These figures help when choosing the right focal length and imaging method. Especially with small pixels, the actual level of detail depends on the combination of telescope, seeing and image scale. For solar imaging, always use a suitable solar filter mounted in front of the telescope.
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