QHY294M-Pro Cooled Mono CMOS Camera


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SKU: 110083

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    QHY294M-Pro Cooled Mono CMOS Camera

    • The QHY294M camera has an 11.7 Megapixel, 4/3-inch, back-illuminated, cooled, monochrome CMOS sensor.
    • On-chip binning has been unlocked.
    • Short back of focus of 11.5 mm.
    • The optical window has a built-in dew heater and the sealed CMOS chamber.
    • The QHY294M has an internal 256MByte high-speed DDR3 image buffer.
    • Fast 16.5 frames per second at high resolution (11.7 MP) with 14-bit A/D.

    The 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.


    TRUE RAW Data

    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
    COMS Sensor SONY IMX492 (MONO)
    Mono/Color Mono only

    (QHY294C  Discontinued in 2022)

    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 14bit
    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
    Anti-Dew Heater Yes
    Telescope Interface M42/0.75
    Back Focal Length 17.5mm
    Weigth 650g

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