The QHY268M is a new generation of back-illuminated CMOS cameras with true 16-bit A/D and 3.76um pixels. This new Sony sensor is an ideal CMOS sensor exhibiting no amplifer glow. 16-bit A/D gives high resolution sampling of the whole full well range. Digitizing 0-65535 levels yields a smooth image with continuous gradation of greyscale levels.
We recommend to use the QHY268M with the CFW3M-US and the QHY OAG-M.
26 Megapixels APS-C format
The QHY268M/C is a cooled, back-illuminated, CMOS camera based on the Sony IMX571 sensor with native 16-bit A/D and 3.76um pixels.
Back-Illuminated, High QE, Zero Amp-Glow and Extremely Low Dark Current
The back-illuminated Sony Exmor sensor has about twice the QE of similar front illuminated sensors. The QHY268M/C has zero amplifer glow. In addition the dark current is only 0.0005e/pixel/sec @ -20C.
On-chip 16-bit ADC - 65536 Levels
The Sony IMX571 sensor has on-chip 16-bit A/D for highest resolution of greyscale. The output is real 16-bits with 65536 levels. Compared to 12-bit and 14-bit A/D, 16-bits provides higher sampling resolution. At high gain, the camera yields close to 1e-/ADU with no sample error and low read noise.
![QHY268M System Gain](https://cdn.shopify.com/s/files/1/0753/5280/1565/t/7/assets/description_image_QHYCCD_QHY268M_System_Gain.jpeg?v=1684345799)
High Dynamic Range - 75ke Full Well
Great full well brings vivid colors. One benefit of the back-illuminated CMOS structure is improved full well capacity. This is particularly helpful for sensors with small pixels. Even with unbinned, the 3.76um pixels of the QHY268M/C has a superb full well capacity of 75ke-.
![QHY268M Full Well](https://cdn.shopify.com/s/files/1/0753/5280/1565/t/7/assets/description_image_QHYCCD_QHY268M_Full_Well.jpeg?v=1684345801)
![QHY268M Dynamic Range](https://cdn.shopify.com/s/files/1/0753/5280/1565/t/7/assets/description_image_QHYCCD_QHY268M_Dynamic_Range.jpeg?v=1684345802)
Ultra Low Read Noise - 1.1e- Noise at High Gain, 3.5e- Noise at Low Gain
The QHY268M/C has only 0.7 electron of read noise at highest gain and 6.8 FPS at full resolution readout speed. One electron of read noise means the camera can achieve a SNR>3 at only 4 to 6 photons. This is perfect performance when conditions are photon limited, i.e., short exposures, narrow band imaging, etc., making this large area sensor ideal for sky surveys and time domain astronomy.
![QHY268M Read Noise](https://cdn.shopify.com/s/files/1/0753/5280/1565/t/7/assets/description_image_QHYCCD_QHY268M_Read_Noise.jpeg?v=1684345804)
2GB Image Buffer
In order to get smooth uninterrupted high speed transfer of data, the QHY268M/C has a large 2GByte DDR3 memory buffer.
USB3.0
USB3.0 interface. 6.8FPS
Best Match for HyperStar System
The small pixels and round camera body of QHY268M/C plus the APS-C size sensor make the QHY268M/C an ideal match for the HyperStar and RASA optical systems.
Specifications
Model |
QHY268M/C |
Image Sensor |
SONY APS-C CMOS Sensor IMX571 |
Sensor Type |
Back Illuminated (BSI) |
Pixel Size |
3.76um x 3.76um |
Color / Mono Version |
Only Color Version Avaliable |
Sensor Surface Glass |
Multi Layer AR coating |
Effective Pixels |
26 Megapixels |
Effective Image Area |
6280*4210 (includes the optically black area and overscan area) |
Full Well Capacity |
51ke- (More than 75ke- in extended full well mode) |
A/D |
Native 16-bit (0-65535 greyscale) A/D |
Sensor Size |
APS-C format |
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
|
Read Noise |
1.1e- High Gain, 3.5e- Low Gain (5.3e- to 7.4e- in extended full well mode) |
Dark Current |
0.0005e/pixel/sec @ -20C 0.001e/pixel/sec @ -10C |
Zero Amplifer Glow |
Yes |
Exposure Time Range |
30us - 3600sec |
Firmware/FPGA upgrade |
Fully Support. via Camera USB port |
Non-volatile memory / On camera storage |
Build-in total 64MByte Flash Memory. 10MBytes user-accessible space for stellar ROI frames for analysis for exoplanet investigation, occultations, atmospheric seeing measurements, focus, optical analysis, etc. Supports 100*100 image x 500 frames; 50*50 image x 4000frames; 25*25 image x 16000 frames; 10*10 image x 250000 frames . |
Shutter Type |
Electronic Shutter |
Computer Interface |
USB 3.0 |
Built-in Image Buffer |
1GByte/2GByte DDR3 Memory |
Cooling System |
Dual Stage TEC cooler(-35C below ambient) |
Anti-Dew Heater |
Yes |
Telescope Interface |
M54/0.75 |
Optic Window Type |
AR+AR High Quality Multi-Layer Anti-Reflection Coating |
Back Focal Length |
12.5mm(±0.3) |
Weigth |
Early Bird Version:980g PhotoGraphic Version:980g Pofessional Version:780g |