QHY533C Colour CMOS camera

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Product Overview

With the advantage of low readout noise and high-speed readout, CMOS technology has revolutionized astronomical imaging. The QHY533M/C is a new generation of back-illuminated CMOS cameras with 3.76um pixels. The QHY533M/C uses the similar series of sensor as the flagship models QHY600 and QHY268, featuring zero glow and low noise.


One benefit of the back-illuminated CMOS structure is improved full well capacity. This is particularly helpful for sensors with small pixels. 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.

Zero Amplify Glow

This is also a zero amplifier glow camera.


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.


Mechanical Dimensions




Pixel Size3.76um x 3.76um
Effective Pixel Area3080*3280 (includes the optically black area and overscan area)
Effective Pixels9MP
Sensor Size1 inch
A/D Sample Depth


Native 14-bit A/D
Full Well Capacity (1×1, 2×2, 3×3)58ke-
Full Frame RateUSB3.0 Port:
Full Resolution  27FPS  @8BIT         18FPS @16BIT
Readout Noise1.3 to 3.4e-
Dark Current-20C,0.0005e- /pixel/sec
Exposure Time Range30us-3600sec
Unity Gain68
Amp ControlZero Amplifer Glow
Shutter TypeElectronic Shutter
Computer InterfaceUSB3.0
Built-in Image Buffer1Gbyte DDR3 Memory
Cooling SystemTwo-stage TEC cooler

Less than 1S lower than ambient temperature -30C in continuous mode

More than 1S continuous mode or lower than ambient temperature -35C in single frame mode

(Test temperature +20°)

Optic Window TypeAR+AR High Quality Multi-Layer Anti-Reflection Coating
Anti-Dew HeaterYes
Telescope InterfaceSupport M48 (with adapter)
Back Focal LengthActual Back Focal Consumed: 14 mm (Combined with CFW)

Standard BFL: 17.5mm(±0.5)



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