Regular price
$ 2,099.00 Sold out
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$ 2,099.00
Unit price


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The QHY268M is a color back illuminated cooled cmos camera with 16bit ADC. 3.76um pixel size, 26mega pixels. Sony IMX571 sensor.

The QHY268M is the CMOS camera with native 16-bit A/D on-chip. The output is real 16-bits with 65536 levels. To compare with the 12bit and 14bit ADC. The 16bit ADC can get high sample resolution, system gain will close to 1e/ADU. No sample error noise 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. Even with unbinned 3.76um pixels the QHY268M has a full well capacity of 51ke-

The QHY268M has 0.7 electron of read noise at highest gain and 6.8FPS full resolution high 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.

The QHY268M is a back-illuminated Scientific CMOS camera with extremely low dark current using SONY's Exmor BSI CMOS technology. In general, the fan-blade mechanical shutter will be broken if it is used 200,000 times or so, and in some specific cases it is easy to fail to switch on or off. The advantage of electronic shutter over mechanical shutter is high reliability and stability when the observatory shoots a large number of pictures. The electronic shutter is a relatively perfect choice for the observatory.

You can check out a great article covering all of the ways QHY is different from other models here.


Model QHY268M
Image Sensor SONY APS-C CMOS Sensor IMX571
Sensor Type Back Illuminated (BSI)
Pixel Size 3.76um x 3.76um
Color / Mono Version Yes
Sensor Surface Glass Multi Layer AR coating
Effective Pixels
26 Megapixels
Effective Image Area
6280*4210 (includes the optic black area and overscan area)
Full Well Capacity 
More than 80ke- on extend fullwell mode
Native 16-bit (0-65535 greyscale) AD convertor
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 0.7e to 3.5e
2.7e to 5.5e in extended full-well mode 
Dark Current 0.0005e/pixel/sec @ -20C        0.001e/pixel/sec @ -10C
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 of exoplanet investigation, occultations, atmospheric seeing messurement, focus , optic analysis etc. Support 100*100 image x 500frames   50*50 image x4000frames. 25*25 image x16000frames 10*10 image *  250000 frames 
Shutter Type Electric Rolling Shutter
Computer Interface USB3.0 
Built-in Image Buffer 2GByte DDR3 Memory
Cooling System
Dual Stage TEC cooler(-35C below ambient)
Anti-Dew Heater
Telescope Interface
Optic Window Type

 AR+AR High Quality Multi-Layer Anti-Reflection Coating

Back Focal Length
Reference Price

Readout Mode is a new function for new QHY Cameras. Different Readout Mode have different driver timing etc and causes the different performance results. Each readout mode has its advantage and disadvantages. QHY600 currently has three readout modes. And in future QHYCCD may add more modes. The Readout mode currently supported by QHY ASCOM Camera Driver and SharpCAP software and the N.I.N.A software. You can find the list box in the software.


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