QHY 294 M/C Pro – Cooled CMOS Camera


Low Readout Noise – 11,7 Megapixels, 4/3″ format.

QHY 294 Pro – CMOS camera, available in different versions:

The new QHY294 Pro is a 4/3-inch back-illuminated camera, equipped with Sony IMX294 (Color) and IMX 492 (Mono) sensor. The 294 Pro has 11.7 MP at 4.63um, 14-bits A/D.

Expanded Pixel Mode – 11.7MP to 46.8MP
The IMX294 and IMX492 chips have 46.8 million 2.315um pixels, which Sony 2×2 bins on-chip to create the sensor’s advertised 11.7 million 4.63um pixel array. The QHY294 Pro series camera is capable of locking and unlocking the on-chip binning to provide two readout modes. The first mode reads the sensor “locked” mode to produce 11.6mp images with 4.63um pixel size and 14 bits per pixel. The second read mode unlocks the binning to produce 46.8mp images with a 2.315um pixel size at 12 bits per pixel.

High QE – Low Readout Noise
Preliminary tests indicate that this sensor will be an outstanding performer with extraordinarily high QE, low read noise, and low dark current. The 294 has 6.8 to 6.9e- read noise at the lowest gain, 1.6e- read noise near unity gain, and 1.0e- read noise at the highest gain, with great dynamic range!

Dual Gain Auto Switch – HGC/LGC MODE
Boosts Low Light Performance
The QHY294 Pro CMOS sensor has a dual gain mode, HGC (high gain), and LGC (Low gain). The QHY294 Pro will switch the two modes automatically when the gain is set to 1600 you will get the benefits of the ultra-low read noise (1e- to 1.6e-) of the HGC mode and a full well capacity of about 14.5ke- at the switch point setting.

Anti-Dew Technology
The QHY294 Pro benefits from more than a decade of cooled camera design experience. QHYCCD has implemented full dew control solutions. The optical window has a built-in dew heater and the CMOS chamber is protected from internal humidity condensation.

Flexible Adapters
The QHY294 Pro has the same body design and mechanical interface and the QHY163 camera. It has a short back focal distance allowing the use of QHYCCD’s 0.5mm-27mm spacers (step size 0.5mm) for flexibility in setting up your optical train. Contact us at

256MB DDR3 Image Buffer
The QHY294 Pro has an internal 256MByte high-speed DDR3 image buffer. This is more than enough for one frame and it significantly reduces any issue of lost frames due to a busy computer CPU or slow USB communication packet errors.


Model QHY294M Pro
QHY294C Pro
CMOS Sensor SONY IMX492 BSI CMOS – in the mono version QHY294M Pro
SONY IMX294 BSI CMOS – in the color version QHY294C Pro
AR Coating On Sensor Yes
Pixel Size 4.63um*4.63um
Effective Pixel Area
Effective Pixels
11.6 mega
Effective Image Area
AD Sample Depth
14bit (output as 16bit and 8bit)
Sensor Size
Typical 4/3inch
Full Frame Rate and ROI Frame Rate
  • 4164*2796 16.5FPS@14BIT
  • 2160lines(eg.4164*2160,4096*2160) 21FPS
  • 1080lines(eg.4164*2160,1920*2160) 41FPS
  • 960lines(eg.4164*960,1280*960) 46FPS
  • 768lines(eg.4164*768,1024*768) 56FPS
  • 480lines(eg.4164*480,640*480) 87FPS
  • 240lines(eg.4164*240,320*240) 156FPS
  • 100lines(eg.4164*100,240*100) 290FPS

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

Readout Noise 1.6e-1.2e@HGC moe  6.9-5.2e@LGC mode
Dark Current
  • 0.002e/pixel/s@-20C
  • 0.005e/pixel/s@-10C
Exposure Time Range 60us-3600sec
Anti-Glow Control Yes
Shutter Type Electric Rolling Shutter
Computer Interface USB 3.0
Built-in Image Buffer 256MByte DDR3 memory
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 are based on 8bit image)
Cooling System
Dual Stage TEC cooler(about -30 to -35C below ambient)
Anti-Dew Heater
Telescope Interface
Optic Window Type AR+AR High-Quality Multi-Layer Anti-Reflection Coating (For color camera user need to add a UV/IR filter in the light path)
Back Focal Length
650 gr.


M13 with QHY294C by Suchao.

M106 with QHY294C by Wang Jiankun.
M81 & M82 with QHY294C by Suchao


NGC3190 with QHY294C by Wang Jiankun

Leo Triplet with QHY294C by Suchao.

M51 with QHY294C by Wang Jiankun



Camera model

294C Pro, 294M Pro, QHY294M Pro+FW-2"+LRGB, QHY294M Pro+FW-036, QHY294M Pro+FW-036+LRGB

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