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.
Sealing Technology
Based on almost 20-year cooled camera design experience, The QHY cooled camera has implemented the sealing control solutions. The sensor itself is kept dry with our silicon gel tube socket design for control of humidity within the sensor chamber. By the way, there’s no oil leaking.
USB3.0
USB3.0 is a very popular interface and very easy to use. USB3.0 can not support a transfer distance of more than 3meter. If you want to get a long-distance under USB3.0, QHYCCD supplies the optional 5meter and 10meter USB3.0 extender cable with a built-in amplifier.
Technical Specifications
| Model |
QHY268MPRO |
QHY268CPRO |
| COMS Sensor |
SONY IMX571 M |
SONY IMX571 C |
| Mono/Color |
Mono |
Color |
| FSI/BSI |
BSI |
| Pixel Size |
3.76um x 3.76um |
| Effective Pixel Area |
6280*4210 (includes the optically black area and overscan area) |
| Effective Pixels |
26MP |
| Sensor Size |
APS-C |
| A/D Sample Depth |
Native 16-bit (0-65535 greyscale) A/D |
| Full Well Capacity (1×1, 2×2, 3×3) |
51ke-
75ke- or above in extended full well mode |
| Full Frame Rate |
USB3.0 Port:
Full Resolution 6.8FPS @8BIT 6FPS @16BIT
2048lines 13.6FPS @8BIT 11.5FPS@16BIT
1080lines 25.4FPS @8BIT 19.5FPS@16BIT
768lines 35FPS @8BIT 25FPS@16BIT
480lines 50FPS @8BIT 34FPS@16BIT |
| Readout Noise |
1.1e- High Gain,
3.5e- Low Gain
(5.3e- to 7.4e- in extended full well mode) |
| Dark Current |
-20C，0.0005e /pixel/sec
-10C，0.001e /pixel/sec |
| Exposure Time Range |
30us-3600sec |
| Unity Gain* |
0（PH Mode）
30（Extended Fullwell Mode）*With the improvement of the CMOS technology, the 16bit CMOS camera has been released, like QHY600/268/411/461. For these cameras, even in lowest gain it has beyond the requirement of unit gain (less than 1e/ADU due to sufficient samples) So you can directly set gain0 as start. Please note QHY600/268C/411/461 has extend full well mode. In this mode you still need to find out the unit gain position. |
| Amp Control |
Zero Amplifer Glow |
| Firmware/FPGA remote Upgrade |
Fully support via Camera USB port |
| Shutter Type |
Electronic Shutter |
| Computer Interface |
USB3.0 and 2*10Gbps Fiber interface |
| Built-in Image Buffer |
2Gbyte DDR3 Memory |
| Cooling System |
Two-stage TEC cooler
Air Cooling Version
Typical -30C below ambient in short exposure time (exposure time < 10sec)
Typical -35C below ambient in long exposure time (exposure time > 30sec)
Water Cooling Version
Typical -45C below ambient in long exposure time (exposure time > 30sec) |
| Optic Window Type |
AR+AR High Quality Multi-Layer Anti-Reflection Coating |
| Anti-Dew Heater |
Yes |
| Humidity Sensor* |
Yes |
No |
| Telescope Interface |
Support M54 and M48 (with standard adapters ) |
M54/0.75 （with CAA）and M48 (with standard adapter) |
| Back Focal Length |
QHY268M: 12.5mm (with CAA)
If used with the QHY filter wheel, the actual calculated intercept is 12.5mm.The actual BFL (the intercept from the CMOS chip to the top of the camera) is 14.5mm. Since most uses will match CFW with monochrome cams, please take 12.5mm as major reference. Check the mechanical drawing below for details.
Note 14.5mm rear intercept does not include adapter thread, which must be used with adapters of various sizes through the top 6 screw holes. |
QHY268C: 17.5mm (without CAA)
This intercept does not include CAA. If CAA is used, it increases by 6mm (23.5mm total). Please check the mechanical drawing below for details. |
| Weigth |
855g |
780g |
In the Box
Manual & Warranty
QHYCCD 2-Years Warranty
