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QHY294M Cooled Monochrome CMOS Telescope Camera


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  • 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. 

Product Details

  • Based on the Sony IMX294C (Consumer) sensor, the QHY294M camera has an 11.7 Megapixel, 4/3-inch, back-illuminated, cooled, monochrome CMOS sensor with 14-bit A/D, 1.6e- read noise near unity gain and 1e- read noise at highest gain. At lowest gain the read noise is 6.8e-. The QHY294M full well capacity is nearly 65,000 electrons with 4.63 um x 4.63 um pixels, almost the same as an interline CCD camera with 9 um pixels.


    QHY 294 M Cooled Monochrome CMOS Telescope Camera-01


    QHY 294 M Cooled Monochrome CMOS Telescope Camera-specsSee the Gallery tab for graphs to the following subjects. Just click on the thumbnails to expand each graph.


    High Sensitivity

    The QHY294M has high QE. The high QE, medium-sized pixels, and extraordinary low read noise and low dark current all combine to produce a camera with very high sensitivity, perfect for astronomical imaging. In addition, the back-illuminated structure provides greater full well capacity and therefore greater dynamic range than front-illuminated sensors with similar architecture.

    Dual Gain Auto Switch - HGC/LGC MODE Boosts Low Light Performance

    The QHY294M's CMOS sensor has a dual gain mode, HGC (high gain) and LGC (Low gain). The QHY294M 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.

    Super Low Dark Current 0.005e-/p/s at -20C

    The QHY294M uses QHYCCD's proprietary low dark current control technology. This technology significantly reduces the dark current noise in our CMOS cameras. The QHY294M has super low dark current as a result, lower than many CCD cameras, allowing for very long
    exposure times.

    High-Resolution 14-bit Frame Rates

    The QHY294M produces 16.5 frames per second at high resolution (11.7 MP) with 14-bit A/D. Higher rates are achieved for regions of
    interest, for example, 21 FPS at 4K resolution, 41 FPS at 1080 lines, 87 FPS at VGA, 156 FPS at 240 lines, etc.

    256MB DDR3 Image Buffer

    The QHY294M 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.

    Anti-Dew Technology

    The QHY294M 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 sealed CMOS chamber is protected from internal humidity condensation.

    Flexible Adapters

    The QHY294M has the same body design and mechanical interface and the QHY163. It has a short back focal distance allowing the use of QHYCCD's 0.5 mm to 27 mm spacers (step size 0.5 mm) for flexibility in setting up your optical train.

    New to the Monochrome version

    The On-chip binning has been unlocked:In the monochrome QHY294M, we have included two read modes, the first reads the sensor like the color version, 11.7 megapixels, 4.63 um pixels, and 14-bits.  The second read mode unlocks the on-chip binning to yield 47 MP at 2.315 um pixels and 12-bits.  Preliminary tests indicate that this sensor will be an outstanding performer with extraordinarily high QE, low read noise, and dark current with great dynamic range.

  • specifications

    ADC14 bit
    Back Focus11.5 mm
    Camera ConnectionFemale M42x0.75
    Color or MonoMonochrome
    Cooling Below Ambient35C
    Dynamic Range13.2 Stops
    Full Rez Frame Rate16.5fps
    Full Well64.067ke
    Max Frame Rate290fps
    Mega Pixels10.3 MP
    Peak QE75%
    Pixel Array3704 x 2778
    Pixel Size4.63 microns
    Read Noise6.83e
    Sensor Diagonal21.4 mm
    Sensor TypeCMOS
    SensorSony IMX294C (Consumer)
    Weight1.4 lb
  • included items

    • QHY 294 M Cooled Monochrome CMOS Telescope Camera-included
    • The QHY294M camera.
    • A desiccant tube.
    • USB30. cable.
    • Locking power cable.
    • M42 2-inch nosepiece.
    • Optional AC to 12VDC adapter or 12VDC cable (varies by country). 

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Great service

Firstly, website was up to date - said the product was in stock and it was in stock. Seems simple enough but in practice many online retailers don't get this sync totally correct, so well done to the people managing inventory! Secondly, fast delivery. 2 days delivered from the USA to the UK. That's impressive. Thirdly, fast response and follow up from sales pre-purchase. Really top stuff.