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QHY294M-PRO + CFW3MUS 7X36 + LRGB (36mm)

QHY294M-PRO + CFW3MUS 7X36 + LRGB (36mm)

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. 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 2.315um pixel size at 12 bits per pixel.

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.


One benefit of the back-illuminated CMOS structure is improved full well capacity. In a typical front-illuminated sensor, photons from the target entering the photosensitive layer of the sensor must first pass through the metal wiring that is embedded just above the photosensitive layer. The wiring structure reflects some of the photons and reduces the efficiency of the sensor.

In the back- illuminated sensor the light is allowed to enter the photosensitive surface from the reverse side. In this case the sensor’s embedded wiring structure is below the photosensitive layer. As a result, more incoming photons strike the photosensitive layer and more electrons are generated and captured in the pixel well. This ratio of photon to electron production is called quantum efficiency. The higher the quantum efficiency the more efficient the sensor is at converting photons to electrons and hence the more sensitive the sensor is to capturing an image of something dim.



In the DSLR implementation there is a RAW image output, but typically it is not completely RAW.  Some evidence of noise reduction and hot pixel removal is still visible on close inspection.  This can have a negative effect on the image for astronomy such as the “star eater” effect.  However,  QHY Cameras offer TRUE RAW IMAGE OUTPUT and produces an image comprised of the original signal only, thereby maintaining the maximum flexibility for post-acquisition astronomical image processing programs and other scientific imaging applications.


Anti-Dew Technology

Based on almost 20-year cooled camera design experience, The QHY cooled camera has implemented the fully dew control solutions. The optic window has built-in dew heater and the chamber is protected from internal humidity condensation. An electric heating board for the chamber window can prevent the formation of dew and the sensor itself is kept dry with our silicon gel tube socket design for control of humidity within the sensor chamber.



In addition to dual stage TE cooling, QHYCCD implements proprietary technology in hardware to control the dark current noise.

Model QHY294M Pro
QHY294C  Pro 
Mono/Color Both
Pixel Size 4.63um*4.63um
Effective Pixel Area 4164*2796
Effective Pixels 11.7MP


46.8MP(Extended Pixel Mode)

Sensor Size 4/3 inch



AD Sample Depth



Fullwell 65ke-
Full Frame Rate Standard 11.6mega pixel mode


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


“Unlock” 47mega pixel mode

8340*5644 4FPS@14BIT and 8BIT


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

Readout Noise 1.6-1.2e- High gain mode


6.9-5.2e- Low gain mode

Dark Current 0.002e/pixel/sec @-20C
0.005e/pixel/sec @-10C
Exposure Time Range 60us-3600sec
Unity Gain 1600 (11MP Mode)


2600 (47MP Mode)

Hardware Anti-Glow Reduction Yes. Can reduce the amp glow of the sensor in long exposure.
Shutter Type Electric Rolling Shutter
Computer Interface USB3.0
Built-in Image Buffer 256Mbyte DDR3 Memory
Cooling System Dual Stage TEC cooler(about -35C below ambient)
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)
Anti-Dew Heater Yes
Telescope Interface M42/0.75
Back Focal Length 17.5mm
Weight 650g

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