ZWO ASI678MC Colour Camera


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Sony’s Latest generation sensor IMX678 with an excellent near-infrared response.
Large full well capacity, high dynamic range, and low readout noise.
This camera has been tested and found to have perfect performance in planetary imaging, solar and lunar imaging.

            ZWO ASI678MC


ZWO ASI678MC adopts Sony’s Latest generation sensor IMX678 with excellent near-infrared response. With the advantages of Large full well capacity, high dynamic range and low readout noise, this camera has been tested and found to have perfect performance in planetary imaging, solar and lunar imaging.

Clear in low light

Thanks to the back-illuminated sensor structure and advanced pixel techno[ogy, the camera has very low readout noise and an ultra-high sensitivity. Especially in Low light conditions, the camera performs very well and is able to capture very clear images of celestial objects.


ZWO ASI678MC can be regarded as an upgrade of ASI178MC. It adopts the latest SONY IMX678 sensor with advanced STARVIS 2 technology. Compared to ASI178MC, this camera features zero amp glow, lower readout noise and higher sensitivity. The dark current noise is greatly decreased; the performance of near-infrared is greatly improved.

USB 3.0 & 256M DDR3 Memory

The camera is equipped with a USB 3.0 transmission interface and a built-in 256MB DDR3 cache to ensure stable and secure data transmission. Under Long exposure, it effectively avoids frame dropping and greatly reduces the glow effect caused by slow reading speed.

Upgraded Model

The ZWO ASI678MC is an upgraded product of the ASI178MC. Compared to the ASI178MC, the ASI678MC has lower read noise, lower dark noise, and no amp glow.

Model  ASI678MC   ASI178MC
Color or Mono  Color Color
With or Without  With  Without
Format   1/1.8″  1/1.8″
Resolution   3840*2160  3096*20
Pixel Size 2ųm 2.4ųm
Readout Noise  0.6-2.7e (1e@8db
QE Peak  83%  80%
Full Well  11.27ke  15ke
ADC   12bit  14bit
Backfocus  12.5mm  12.5mm
MAX FPS  47.5 fps  60 fps
Diagonal   8.86mm 8.95mm

No Amp Glow

ZWO ASI678MC exhibits zero amp glow, no matter how long the exposure and how high the gain value is.  Since it is implemented directly at the hardware level, it does not require software control.

HCG Mode

The camera has a built-in I-ICG mode, which can effectively reduce readout noise at high gain. This allows the camera to maintain the same high dynamic range as it does at [ow gain. When the gain is 182, the I-ICG mode is automatically turned on. The readout noise is as low as 0.8e, and the dynamic range can still reach a level close to 12bit.


Quantum Efficiency

The QE curve and readout noise are very important parameters to measure the camera’s performance. Higher QE and tower readout noise are necessary to improve the image signal-to-noise ratio.


Dark Current Noise

ASI678MC has much lower dark current noises than ASI178, bringing it has better image signal-to-noise ratios. If we compare the darks frames captured with these two cameras, it can be easily found that the frame from ASI678 has much Less noise and rooks much smoother.


Instruction Manual


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