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  • QHYCCD QHY268M Mono
  • QHYCCD QHY268M Mono
  • QHYCCD QHY268M Mono
  • QHYCCD QHY268M Mono
  • QHYCCD QHY268M Mono
  • QHYCCD QHY268M Mono
Now: US$2,159.00
Was: US$2,399.00
Frequently bought together:


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

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

QHY268M Dynamic Range

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

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 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.


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)
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
Telescope Interface
Optic Window Type

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

Back Focal Length
Early Bird Version:980g
PhotoGraphic Version:980g
Pofessional Version:780g


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Warranty Information

2-Year Warranty with the exception of sensors, TEC modules and cables. Read more.
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1 Review

  • 5
    QHY268M camera

    Posted by David Swinnard on Aug 16th, 2021

    My initial results (no moon, only moderate sky transparency, Bortle class 4) were beyond my expectations. This is my first cooled camera, I came from a Fuji X-T3 mirrorless. These two cameras share the same sensor but the full 16 bits and monochrome operation put the QHY into another realm completely. I stretched the budget to get this model but I am very glad I did. I do not expect to outgrow this camera for many years.

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