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The QHY5III678M/C is an upgraded version of the QHY5III178M/C, belonging to the second generation of the QHY5III series. It serves as both a planetary camera and a guiding camera, featuring excellent near-infrared high sensitivity. Here are some key details about this camera:

  1. Sensor and Sensitivity:

  2. Front-End Design and Compatibility:

    • The QHY5III678M/C features a new front-end design for better compatibility.
    • With a back focal length (BFL) of only 8mm, it easily pairs with off-axis guiders (OAGs).
    • The basic top adapter includes 1.25-inch threads, allowing compatibility with 1.25-inch filters.
    • The top adapter glass can be switched, enabling the use of filters even when using lenses.
    • Additionally, it supports CS lenses and C-mount lenses1.
  3. USB Interface:

  4. Guiding Interface:

In summary, the QHY5III678M/C is a versatile camera suitable for planetary imaging and guiding, with enhanced sensitivity in the near-infrared spectrum.

You can find more information about these cameras on the QHYCCD website.

Extended Near Infrared Sensitivity

In this latest generation of sensors, the QHY5III678M/C photodiode portion of the pixel well is physically deeper than in previous sensors, allowing photons of longer wavelengths to penetrate deeper into the substrate. This dramatically increases the sensor’s sensitivity to red and near-infrared (NIR) light. The sensor displays almost equal peak sensitivity to NIR light as it does to light in the visible spectrum.


QHY5III Series V2 Introduction
512MB DDR3

The QHY5III678M/C series planetary and guiding cameras are all equipped with a 512MB DDR3 image buffer which can effectively reduce the pressure on computer transmission, a great help for planetary photography which often requires writing a large amount of data in a short period of time. Some deep-sky astrophotography cameras on the market today only have 256MB, for example.

In comparison, the 512MB DDR3 memory of the new 5III (Ver. 2) series cameras represent a significant upgrade.





New Front-end Design with Better Compatibility

QHY5III (Ver. 2) series cameras have adopted a new front-end design with better compatibility. Here we only take QHY5III200M as example, however, ALL V2 cams in the future share these features.

The BFL of V2 cam is only 8mm, which means you can easily use a V2 camera with your OAG. The basic top adapter includes 1.25 inch threads and you can still use your 1.25 inch filter.

The top adapter of V2 can easily be swapped out with different option included in the product. One of the advantage of changeable top adapter is you can use one filter even you’re using Lens! You can add a 1.25inch-cs adapter to connect CS lens or add a second CS-C lens for C-mount lens. The two adapters are all standard accessories of V2 cams.

By the way, there’s a 1.25 inch filter wheel adapter to connect your mono planetary camera with QHYCFW3-S filter wheel.

USB 3.2 Gen1 Type C Interface

The new QHY5III678M/C series cameras all use the USB3.2 Gen1 Type-C interface. Compared to the USB3.0 Type-B interface used in the previous generation, the Type-C interface has a longer life and is more flexible.

Tips: It is recommended to use the official standard Type-C data cable of QHYCCD. As the market is flooded with a large number of poor-quality Type-C cables, casual use may lead to the camera malfunctioning. If you use your own spare cable, please make sure it is a high-quality cable.


Universal Guiding Interface

The custom interfaces of the previous generation of planetary cameras and guiders has been replaced in the QHY5III (Ver.2) cameras with a more universal ST-4 compatible guiding interface. Now, even if the guiding cable is lost or damaged, you will be able to easily get a replacement on the market at a low cost.



Indicator LED

The QHY5III678M/C series of cameras is equipped with a status indicator at the back of the camera. If the camera experiences an abnormal status, the multi-colored indicator light will help to determine the situation with different colors signifying different conditions. During normal operation this indicator light is off, so there is no worry about light contaminating the image.



Model QHY5III678
CMOS Sensor Sony IMX678
Pixel Size 2.0um*2.0um
Effective Pixel Area 3856*2180
Effective Pixels 8.4 Mega Pixel
Fullwell 9ke-
Readout Noise 0.57-3.3e-
AD Sample Depth 12-bit (output as 16-bit and 8-bit)
Built-in Image Buffer 512MB DDR3 Memory
ROI Frame Rate Full Resolution  43FPS  @8BIT         22FPS @16BIT

1920Lines             85FPS      @8BIT          43.5FPS @16BIT

640Lines             99FPS    @8BIT          93FPS @16BIT

Exposure Time Range 11us-900sec
Shutter Type Electric Rolling Shutter
Computer Interface USB3.2 Gen1 Type-C
Guide Port st4
Telescope Interface 1.25-inch, compatible with CS-port and C-port lenses by replacing the front-end connector (An IR AR glass and an IR850nm filter are included in the standard version.)
Back Focal Length 17mm(with adapter); 8±0.5mm(without adapter)
Weight 90g
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