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QHY 294M Pro Mono Camera


4/3" Back Illuminated Mono Cooled Camera
The new QHY294M Pro is a 4/3-inch back-illuminated camera, equipped with a Sony IMX492 (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 2x2 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.


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 highest gain, with great dynamic range!


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 as the QHY163. 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.


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.

COMS Sensor
AR Coating On Sensor
Pixel Size
4.63um*4.63um / 2.314um*2.315um
Effective Pixel Area

4164*2796 (standard 11.6mega pixel mode)

8340*5644 ("unlock" 47mega pixel mode)

Effective Pixels
11.6 mega pixel and 47 mega pixel
Effective Image Area
AD Sample Depth

14bit (output as 16bit and 8bit)  in Standard 11.6mega pixel Mode

12bit (ouput as 16bit and 8bit)  in "Unlock" 47mega pixel Mode

Sensor Size
Typical 4/3inch
Full Frame Rate and ROI 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
1.6e-1.2e@HGC moe  6.9-5.2e@LGC mode
Dark Current



Exposure Time Range
Hardware Anti-Glow Reduction
Yes. Can reduce the amp glow of the sensor in long exposure.
Shutter Type
Electric Rolling Shutter
Computer Interface
Built-in Image Buffer
256MByte DDR3 memory

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