QHYCCD QHY268PRO M, Manual

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Overview
QHY268 Pro M has SONY IMX571 APS-C format CMOS sensor inside. 26mega pixels, Back-illuminated, native 16BIT ADC. QE
is up to 91% and readout noise is as low as 1.1e Even with a 3.76um pixel size, it has a big full-well up to 75ke. It has extremely
low thermal noise 0.0005e/pixel/sec @ -20C, ZERO amplifier-glow performance, It has a maximum frame rate of
6.8FPS@16bit full resolution.
QHY268PRO-M has only monochrome version. QHYCCD also supplies its liquid-cooling version, which is a customized type
and needs to be pre-ordered).
Native 16 bit A/D: The new Sony sensor has native 16-bit A/D on-chip. The output is real 16-bits with 65536 levels.
Compared to 12-bit and 14-bit A/D, a 16-bit A/D yields higher sample resolution and the system gain will be less than 1e-
/ADU with no sample error noise and very low read 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: This is also a zero amplifer glow camera.
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.
Cooling: In addition to dual stage TE cooling, QHYCCD implements proprietary technology in hardware to control the dark
current noise.
Interfaces
2*10g