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.
BSI
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
The QHY533 This is also a zero amplifier glow camera.
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.
Cooling
In addition to dual stage TE cooling, QHYCCD implements proprietary technology in hardware to control the dark current noise.
Design
QHY533M and 533C have different interface designed to be more flexible to deal with different use scenarios.
QHY533C will offer a free Adapter Kit E, which can be directly connected to the 55mm BFL M48 interface MPCC, or Nikon / Canon DSLR lens (QHY COMBO B2, sold separately). At the same time, the QHY533C provides C-port thread and you can directly mount C-port lens.
QHY533M parallel position adjustment
The QHY533M uses threads to connect to the QHYCFW3S，so there might be a small problem: the sensor may not remain parallel to the filter wheel when the threads are fully rotated. In this case you can adjust the front part of the 533M to the angle of sensor correct.
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Specifications
| Model | QHY533M | QHY533C |
| CMOS Sensor | SONY IMX533 M | SONY IMX533 C |
| FSI/BSI | BSI | |
| Pixel Size | 3.76um x 3.76um | |
| Effective Pixel Area | 3080*3280 (includes the optically black area and overscan area) | |
| Effective Pixels | 9MP | |
| Sensor Size | 1 inch | |
| A/D Sample Depth | Native 14-bit A/D | |
| Full Well Capacity (1×1, 2×2, 3×3) | 58ke- | |
| Full Frame Rate | USB3.0 Port: Full Resolution 27FPS @8BIT 18FPS @16BIT | |
| Readout Noise | 1.3 to 3.4e- | |
| Dark Current | -20C，0.0005e- /pixel/sec | |
| Exposure Time Range | 30us-3600sec | |
| Unity Gain | 68 | |
| Amp Control | Zero Amplifer Glow | |
| Shutter Type | Electronic Shutter | |
| Computer Interface | USB3.0 | |
| Built-in Image Buffer | 1Gbyte DDR3 Memory | |
| Cooling System | Two-stage TEC coolerLess 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 Type | AR+AR High Quality Multi-Layer Anti-Reflection Coating | |
| Anti-Dew Heater | Yes | |
| Telescope Interface | – | Support M48 (with adapter) |
| Back Focal Length | Actual Back Focal Consumed: 14 mm (Combined with CFW) Standard BFL: 17.5mm（±0.5） | 17mm |
| Weight | 845g | 845g |
Curves
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Mechanical Dimensions
QHY 533M
QHY 533C
Accessories and Match
QHY533M
QHY533C
Documentation:
