Astronomy Specialist



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The QHY 247C Pro is a cooled colour camera with large pixels and low noise. It contains the Sony IMX 193, an APS-C sensor which is also used in the Nikon D5300 and D5500 DSLR cameras. The QHY 247C camera has the lowest read and thermal noise among the 165/168/247/367 cameras.

Unlike the DSLR cameras, the QHY 247C Pro offers true RAW image output that only records the signal. Standard DSLR's have the RAW output option but the file is altered with noise reduction and hot pixel removal, undermining the maximum post processing flexibility.

This camera has a two-stage TEC cooling system that brings the temperature of the sensor 35C° below ambient for low noise imaging, even in warm climates. The dark current at -15°C is only 0.0012 electron/pixels. In addition to thermoelectric cooling, QHYCCD employs a unique thermal noise control technology to reduce CMOS sensor noise to a very low value without affecting the integrity of the raw image. The QHYCCD proprietary technology produces a much better noise reduction than any other astronomy camera in the market. QHYCCD has more than 10 years of experience designing cooled cameras. The QHY 247C employs a full anti-dew technology for both CCD sensor cover glass and the sensor chamber optical window.

The 128MB DDR II memory buffer facilitates the download of images to the computer, especially when USB traffic is high, the writing speed of your computer is slow or occupied in other processes. 

In order to avoid halos around bright stars, the QHY 247C has an AR coated optical window on both sides rather than the common IR/UV cut window. Also, the protection glass of the sensor is AR coated to maximize light transmission and minimize internal reflections. For a better RGB colour balance, it is recommended to use a UV/IR cut filter.

Every QHY 247C Pro camera is carefully calibrated with a high-precision axis measurement device. Orthogonal placement of the sensor in the camera body is guaranteed to be flat to the image plane with a precision better than +/-20µm across the sensor, from edge to edge, so there is no need to adjust the camera tilt. That is an enormous advantage especially in fast telescopes such as F/2.8-F/4 astrographs that are very sensitive to tilted sensors.

The QHY 247C has zero amplifier glow no matter how long the exposure is.



QHY has designed a number of adapter/spacer kits for the 247C for different setups:

Connection to coma corrector requiring 55mm backfocus and M48 interface

Connection to Canon EF lens

Connection to Nikon F lens


Sensor Sony IMX 193 APS-C CMOS - COLOUR
Resolution 24 Megapixels 6024 x 4024
Pixel size 3.91 µm
Sensor size 23.55 mm x 15.73 mm (28.32 mm diagonal)
Exposure range 50µs-3600s
Read noise 1.0e- at high gain ; 2.7e- at lowest gain
Dark current 0.0012 e-/pixel/sec @ -15C
Full well capacity 36,000 e-
Bit rate 14 bit ADC
Frame rate 3 fps at full resolution
Shutter type Rolling shutter
Cooling ΔT of 35°C Dual Stage TEC cooler
Memory buffer 128Mb DDR II
ROI Supported
Compatibility Mac, Windows, Linux
Optical window AR coated (both sides)
AR coating on sensor YES
Ports USB 3.0
Compatibility Mac, Windows, Linux
Back focus 17.5 mm
Connections M54 x 0.75 female thread (in the camera)
Dimensions Ø 90 mm; ↨ 104.5 mm
Weight 700 g
Power supply 12V 3A  (2.1×5.5 mm connector)





  • QHY 247C Pro
  • USB 3.0 cable (1.5m)
  • Screw jack power cable (5.5-2.1mm male jack with locking nut to 5.5-2.1mm female jack).
  • Desiccant Drying Tube (desiccant not included)
  • Camera dovetail to M54 x 0.75 adapter with 3 thumb screws at 120°
  • M54 x 0.75 to 2"adapter (2.5mm optical thickness, M48 x 0.75 internal thread for standard 2" filters).


    Guide to installing QHY and ASCOM drivers for QHYCCD cameras.

    ZWO camera software QHY camera drivers

    ZWO camera software QHY 247C manual

    Welcome Newcomer