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Model QHY174GPS
Pixel Size 5.86um*5.86um
Effective Pixel Area 1920*1200
Effective Pixels 2mega
Effective Image Area 11.25mm*7.03mm


“This effort, spanning six months, three spacecraft, 24 portable ground-based telescopes, and NASA’s SOFIA airborne observatory was the most challenging stellar occultation in the history of astronomy, but we did it!” said Alan Stern, New Horizons principal investigator from SwRI.





The QHY174GPS camera uses the 1/1.2-inch SONY IMX174 CMOS sensor with global shutter, 5.86um pixels,138FPS@1920*1200, high QE of 78%, and low read noise of 3-5e-. It is useful for imaging occultations, eclipses, meteors, and other scientific imaging requiring a highly precise recording of the time and location of the observation on every frame.

The QHY174GPS has a unique built-in GPS module that can sync with the atomic clock signals received from GPS satellites.  The QHY174GPS can record the start and end of exposure time with 1us precision anywhere on earth. The QHY174GPS was selected by the NASA New Horizons Team to successfully captured the MU69 occultation in the Summer of 2017. The QHY174M-GPS has dual stage TE cooling to -45C below ambient with full anti-moisture control including heated optical window and removable desiccant plug for the sensor chamber. The QHY174 also has an anti-amp glow function.  It can reduce the IMX174 sensor’s amplifier glow significantly in long exposures.

The QHY174M-GPS records the global shutter exposure starting and ending time with microsecond precision.  Two QHY174 cameras, for example, each located anywhere in the world, can have the same time base, accurate to microseconds.  In order to guarantee the starting and ending time of the exposure, the QHY174 has a built-in LED pulse calibration circuit precise to 1 microsecond.

Global Shutter

Unlike the rolling shutter technology used in most CMOS cameras, a global shutter guarantees that the exposure time for the whole image area is uniform, beginning and ending at exactly the same time. This type of shutter is ideal for high precision applications. For high speed moving object and the atmospheric agitation the global shutter can generate undisborted imaging and realizes high picture quality.

Double Working Modes

Master mode:  In Master Mode, the camera is free running and the internal 10MHz GPS synced clock will measure and record the shutter’s opening and closing time.

Slave mode:  In Slave Mode you can input a target start time and the interval period for two frames. For example: You want three cameras in different locations (maybe thousands of kilometers apart) to start an exposure at 2016.3.9.UTC 14:00:00.000000 and then to continue with exposures at the interval time of 0.100000 sec.  After you input these value, all the three cameras will wait until this time and then simultaneously start video recording, e.g.:

2016.3.9 UTC 14:00:00.000033

2016.3.9 UTC 14:00:00.100033

2016.3.9 UTC 14:00:00.200033

2016.3.9 UTC 14:00:00.300033

(The 0.00033 is a global delay of the CMOS shutter).

The time stamp and other GPS information is embedded into the image. The software decodes it in real time and displays the information on left.  Since the data is embedded, it will never be lost so long as you keep the original image.

Model QHY174GPS
Pixel Size 5.86um*5.86um
Effective Pixel Area 1920*1200
Effective Pixels 2mega
Effective Image Area 11.25mm*7.03mm
QE 78%
Fullwell >32ke-
AD Sample Depth 12/10bit (output as 16bit and 8bit)
Sensor Size Typical 1/1.2 inch
Full Frame Rate and ROI Frame Rate 138FPS@1936×1216



*Note:QHYCCD has optimized the cmos drive frequency and limit the max frame rate. The CMOS sensor may not work under the max frequency to ensure the better noise performance. If you need the customized higher frame rate version, please contact QHYCCD.

ROI Support Yes. Any Area ROI
Readout Noise 5.3e-@Gain0%      2.8e-@Gain60%      1.6e-@Gain100%
Exposure Time Range 5us-900sec
Binning 1×1,2×2
Anti-Glow Control Yes (Reduces amplifier glow significantly)
Shutter Type Electric Global Shutter
Computer Interface USB3.0 Super Speed
Non-volatile memory / On camera storage Build-in total 512Kbytes Flash Memory. 100Kbytes user-accessible space for stellar ROI frames for analysis of exoplanet investigation, occultations, atmospheric seeing measurement, focus , optic analysis etc. Support 100*100 image x 10rames   50*50 image x40frames. 25*25 image x160frames 10*10 image * 1000 frames (total frame numbers is based on 8bit image)
Cooling System Dual Stage TEC cooler(-40C below ambient),

(Test temperature +20°)

Temperature Regulated

Anti-Dew Control Connector for removable silicon gel tube

Heater board for CMOS chamber optical window

Telescope Interface M42/0.75 / 2inch faster installer. Optional C-mount adapter
Optic Window Type Mono Version: AR+AR High Quality Multi-Layer Anti-Reflection Coating

Color Version: IR cut coating

Guide Port 6PIN RJ11 Guide Port
Color Wheel Port 4PIN QHYCFW Socket
Back Focal Length 17.5mm
Weigth 450g
GPS version, Time-Stamp Precision 1 micro-second of the GPS UTC clock
Reference Price QHY174M-GPS      USD1239   w/TE Cooling

User Guide
Before Start: Install "All-In-One" Pack




Before Start: Input Voltage Requirements

The camera requires an input voltage between 11V and 13.8V. If the input voltage is too low the camera will stop functioning or it may reboot when the TEC power percent is high, causing a drain on the power. Therefore, please make sure the input voltage arrived to the camera is adequate. 12V is the best but please note that a 12V cable that is very long or a cable with small conductor wire may exhibit enough resistance to cause a voltage drop between the power supply and the camera. The formular is: V(drop) = I * R (cable). It is advised that a very long 12V power cable not be used. It is better to place the 12V AC adapter closer to the camera.

First connect the 12V power supply, then connect the camera to your computer via the USB3.0 cable. Make sure the camera is plugged in before connecting the camera to the computer, otherwise the camera will not be recognized. When you connect the camera for the first time, the system discovers the new device and looks for drivers for it.  You can skip the online search step by clicking “Skip obtaining the driver software from Windows Update” and the computer will automatically find the driver locally and install it. If we take the 5IIISeries driver as an example (shown below), after the driver software is successfully installed, you will see QHY5IIISeries_IO in the device manager.

Please note that the input voltage cannot be lower than 11.5v, otherwise the device will be unable to work normally.

Install "All-In-One" System Pack

All-in-one Pack supports most QHYCCD models only except PoleMaster and several discontinued CCD cameras.

Download Page: https://www.qhyccd.com/download/

Video Tutorial: https://www.youtube.com/embed/mZDxIK0GZRc?start=1

  • Since most of the contents of All-in-one package are plug-ins that support third-party software, the third-party capturing software that you want to use must be installed before the All-in-one package. Otherwise the program will report an error.
  • ALL-IN-ONE Pack contains:
    • System Driver, which is necessary for the camera operation and must be installed.
    • WDM Broadcast Driver, which can provide a live signal to Obs and other live software, you can install it if you have such needs like opeing a live show.
    • EZCAP_QT , which is developed by QHYCCD and can be used in QHY devices tests, and management of updates. So even if you won’t use EZCAP_QT for capturing, we suggest you install it.
    • Ascom driver, which is necessary for the camera used in Ascom (the latest version of Ascom is 6.6).
    • The two sorts of Ascom CFW Drivers correspond to two methods of controling the filter wheel: USB control and camera serial control. It is recommended that both drivers should be installed if you have a filter wheel.
    • CP210X_VCP is a serial driver. Some computers come with the driver, but the computer without the driver may be failed of controling the filter wheel.
    • SDKs for Third-party Software: Just pick and install the corresponding SDK according to the software you want to use. Don’t forget to check whether the software you are using is 32-bit or 64-bit and select the right SDKs.
    • SHARPCAP is also included in the pack, you can choose 32-bit or 64-bit to install. This is authorized by SHARPCAP.
    • QT LIB is a plug-in to ensure that 64-bit software can exeuate normally on some computers with poor compatibility.
  • Difference between Stable version and Beta Version: Beta version is the latest version, which gives priority to support for the latest products (the stable version may not be compatible with those yet), and has some of the latest optimized ,but experimental features. The stable version is older than the beta version but more stable, so it is recommended for beginners who are not using the latest products.
  • Don’t let the camera connect to the computer during the All-in-one pack installation process;  connect it to the computer after all the installation is complete.
Connect Software

Before using software, make sure you have connected the cooling camera to the 12V power supply and connected it to the computer with a USB3.0 data cable. If it’s an uncooled camera, 12V power is not needed.

Note: We recommend 64-bit Software if possible, like SharpCAP x64 , N.I.N.A x64. etc., especially when you’re using 16bit cameras.


EZCAP_QT is software developed by QHYCCD. This software has basic capture functions for QHYCCD deep sky cameras.

Run EZCAP_QT. Click “Connect” in Menu -> Camera. If the camera is successfully connected, the title line of EZCAP_QT will display the camera firmware version and the camera ID as shown below.

Click “Temperature Control” in “Camera Settings” to set the temperature of the CMOS sensor. You can turn on “Auto” to set the target temperature. For example, here we set the target temperature to -10C. The temperature of the CMOS sensor will drop quickly to this temperature (approximately 2-3 minutes). If you want to turn off cooling, you can choose Stop. If you just want to set the TEC power but not the temperature. You can select “Manual” and then set the percentage of the TEC power.

You can use the “preview tab” to preview and use the focus tool to focus. Then use the “capture tab” to capture the image.


Launch SharpCap. If the software and drivers mentioned above are installed successfully, the video image will appear automatically about 3 seconds after the software loads. You will also see the frame rate in the lower left corner of the software window as shown below.

If you have already started the SharpCap software before connecting the camera, in order to open the camera, click on the “camera” in the menu bar and then select the device.

Offset adjustment. When you completely block the camera (i.e., like taking a dark frame) you may find that the image is not really zero. Sometimes this will reduce the quality of the image contrast. You can get a better dark field by adjusting the offset. You can confirm this by opening the histogram as indicated in the figure below.


If you want to enter the 16-bit image mode, select the “RAW16” mode.

By selecting the “LX” mode you can expand the exposure setting range and take long exposures.

After cooling devices connected to the 12V power supply, the temperature control circuit will be activated. You can control the CMOS temperature by adjusting the settings in the figure below. Basically, you can control the temperature of CMOS by either adjusting “Cooler Power” or clicking “Auto” and setting “Target Temperature”. You can also see the CMOS temperature at the lower-left corner of the software window.

ASCOM supported software (e.g. MDL)

With ASCOM drivers, you can use the device with many software packages that support the ASCOM standard. We will use Maxim DL below as an example, but a similar procedure is used for The SkyX and other software packages supporting ASCOM.

First make sure you have not only loaded the ASCOM drivers but that you have also downloaded and installed the ASCOM platform from ASCOM. After both the drivers and platform are installed, start MAXIMDL. Follow the instructions shown below to finish the setup. Then Click Connect in and enter the software.


BroadCast WDM Camera Driver

QHYCCD BroadCast WDM Camera is a broadcast driver that supports QHYCCD cameras with video broadcast function, which can meet the needs of customers to send video images to other target software. For example, use sharpcap to connect a WDM-enabled camera, and the sharpcap display video image can be sent to other WDM-supported software for display, which is suitable for video online broadcast applications.

Perform the AllInOne installation and check the BroadCast WDM Camera option.

The installation process is over, right-click the computer to find the device manager, and check that the image device name is QHYCCD BroadCast WDM Camera, which means the installation is successful.

Activate the function:
Usually sharpcap is used to connect the camera as the broadcasting terminal. After connecting the camera, you need to turn on the Enable Live Broadcast switch to broadcast.

Common supporting software (ie, broadcast receiver) includes: UFOCAPTURE, HANDYAVI, QQ video functions, etc.
AMcap test effect chart:

HANDYAVI test effect chart:

UFOCAPTURE test renderings:

Currently only supports Windows system.
Currently, the SDK does not support 16 bits for the time being.
RGB24 mode must be selected for color images, otherwise the image will appear gridded.
Appendix:Exernal Trigger Mode Manual

Suitable for the following camera with a global shutter.

Use Sharpcap software as the capture software. QHYCCD Advnanced tools as the External trigger mode setting software.
1.Run SharpCAP, You will see the live video appearing
2.Run advanced control tools. Check on the “SDKAPI_MODE” Click “Coonect”

Mode 1:Hardware External Trigger. The exposure time is depent on the external pulse width
In the Trig Input Souce trigger input source drop-down selection, select Trig Input Pin Direct. The meaning is to trigger the input source as the external trigger input port of the camera (opto-coupled isolated, RCA gold plug); Select one in Trig Controller Source (the marquee doesn’t make sense for this mode, so choose one)


Press the TRIG MODE ON button. You will find that the video image in sharpCAP software stops. The camera has entered a waiting outside trigger state. Trigger the input port via the photoelectric isolation and enter a high level. You’ll find that the image takes a frame, and the longer the duration of the high level, the longer the image will be exposed. In this mode, the exposure time is equal to the duration of the high level.

Mode 2:Out-of-hardware trigger, exposure time set by the software
Press the diagram to set it up. Choose XTRIG CONTROLLER in Trig Input Source, Trig Input Phase to Rise Edge, Trig Controller Controller Enable Source select Trig Controller by Hardware. And enter exposure time, such as 50ms. Then click the TRIG MODE ON button to complete the setting of the mode and the exposure time setting.

By triggering the input interface outside the photoelectric isolation, a short high level is entered and a frame is captured on the image in SHARPCAP. Note that if the input is consistently high, the camera continues to shoot under the setting of a longer exposure time. To avoid continuous shooting, the high-level time of the input trigger is short, e.g. 1ms

Mode 3: Out-of-software trigger, exposure time is determined by the software command interval
In this mode, the software sends a start exposure instruction through the software, and then the software waits for a delay. Then send an end exposure instruction. A trigger for software control is possible. Its exposure time is equal to the time between the start and end exposure commands. Just follow the settings below. Once set up, click TRIG MODE ON to feed the instruction. Then click on the Software Register Trig Test button to observe the shooting. To modify the exposure time, you only need to modify the value sits in the exposure time box, instead of clicking TRIG MODE ON, just click the RegisterSoftware Trig Test button.

Mode 4:Out-of-software trigger, exposure time set by the software
In Mode 3, there is a problem with a less stable and accurate exposure time. The reason is that the time interval between the two instructions sent by the upper computer is not so precise and will be affected by CPU delay, busyness and other factors. Therefore, mode 4 is also provided. Set the pattern as shown below.

In this mode, exposure time is set by the software and performed by the hardware inside the camera, rather than by the interval between the two commands that the upper machine starts and ends exposure, so the exposure time is accurate and repeatability is very good. The upper machine only needs to issue a start exposure and end exposure instructions. The interval between the two instructions is as short as possible, for example, about 1ms. The camera will be exposed according to the exposure time set by the software, not the command interval.

Mode 5: Out-of-hardware trigger, sequence shooting
In this mode, continuous shooting can be achieved by means of external triggering. The camera is waiting until a trigger signal is given, and once a trigger signal is given, the camera starts shooting continuously. Exposure time is set by the software.
Follow the figure below to set it up. Once set up, press the TRIG MODE ON button to keep the camera waiting, and then enter a high-level pulse from the optically isolated trigger input to trigger continuous shooting by triggering continuous shooting by the camera. (It is important to note that QHY174 does not work when the exposure time is short, and the exposure time is longer.) If you want to enter the next wait state, click TRIG MODE ON to restore the camera to the waitstate and wait for the next external trigger pulse to arrive.

Mode 6: Out-of-software trigger, sequence shooting
Similar to Mode 5, the trigger source is entered from external hardware to software control. After pressing the diagram to set up, click TRIG MODE ON, the camera waits, at this time click on the Software Register Trig Test button, after the start signal, you can see the start of continuous shooting.

Additional instructions:
The SHARCAP software has a random horizontal horizontal stripe noise reduction feature in the right menu bar. CMOS of the global shutter, such as 174, horizontal random horizontal stripes are more obvious at high gain, and this column can be adjusted appropriately. Comparing the image below, there is no on and off effect, and the difference can be seen.

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