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QHY 268M Photographic Cooled Monochrome CMOS Camera


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  • Photographic Version of the QHY268
  • Ultra High Resolution with a 26 MP APS-C format
  • Monochrome, back-illuminated cooled CMOS camera with 16-bit ADC.
  • Great Full Well of 51ke- at 3.76 um.
  • Ultra Low Read Noise with only 1 to 4 electron of read noise at high gain and a 15/fps high readout speed.
  • Short exposures, narrow band imaging, etc., making this large area sensor ideal for sky surveys and time domain astronomy.

Product Details

  • The QHY268 Photographic Cooled Monochrome CMOS Camera has a back-illuminated 26 megapixel APS-C sensor with 16-bit ADC and 3.76 um pixel size.

    Native 16-bit ADC 65536 Levels

    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 12-bit and 14-bit ADC. The 16-bit ADC can get high sample resolution, system gain will be less than 1e/ADU. No sample error noise and low noise. 

    Great Full Well: 51ke- at 3.76 um

    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 3.76 um pixels the QHY268M has a full well capacity of 50ke- 

    Ultra Low Read Noise

    With a 1 to 4 e read noise, the QHY268M has only one electron of read noise at high gain and 15/fps 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. 

    Back-Illuminated: Electric Rolling Shutter and Low Dark Current

    This back-illuminated Scientific CMOS camera has 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. 

    Best Match for a HyperStar or RASA System

    The round camera case design of QHY268M and the imager size is your best match for Hyperstar or RASA systems. 


    Using the USB3.0 interface you transfer at 6/fps. 

    TEC Cooling

    The QHY268M has regulated TEC Cooling with 2-stage TE Cooler. 

    The differences between the Photographic and Professional versions include:

    • Professional version has a high-speed fiber interface and USB3.0 interface. Photographic version has only a USB3.0 interface.
    • Professional version may has more on-camera DDR3 memory than the Photographic version.
    • Professional version has rich, external, expandable I/O signals as well as a rich resource that allow the user to customize the FPGA inside the camera.
    • Professional version is more expensive than Photographic version.
    • Professional version has a longer body to accommodate the length of the optical fiber interface.
  • specifications

    ADC16 bit
    Anti Dew HeaterYes
    Back Focus17.5 mm
    Buffer2 GB DDR3
    Camera ConnectionFemale M54x.75
    Color or MonoMonochrome
    Delta T35C
    Dynamic Range14.1 Stops
    Free ShippingYes
    Full Rez Frame Rate6.8fps
    Full Well51ke
    Max Frame Rate50fps
    Mega Pixels26.4 MP
    Peak QE78%
    Pixel Array6280 x 4210
    Pixel Size3.76 microns
    PortUSB 3.0
    Read Noise3e
    Sensor Diagonal28.4 mm
    Sensor SizeC Format
    Sensor TypeCMOS
    SensorSony IMX571
    Free ShippingYes
  • included items

    • QHY QHY268M Photographic Cooled Monochrome CMOS Camera

Product Reviews

Customer Reviews
4.0 Based on 3 Reviews
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  • 12.5
  • 268M
  • flow
  • point
  • standard
  • noise
  • Newtonian
  • front
  • upgrade
  • coma corrector
United States United States


Couldn't figure out what I was seeing in calibration frames. Then distorted lights. Turns out the camera had copious amounts of condensation (inside and outside the sensor). Tech at QHY asked me to return the camera after I sent them the images. A desiccant tube was included, but the images were so bad I thought a hairdryer was needed (not really). I returned the 268M. Waiting to try the ASI2600MM Pro. We'll see.

James F.
United States United States

Awesome camera

This is a huge upgrade from my 1600... much better than I expected. Zero amp flow and a huge full well along with so little noise makes this thing incredible. The 268m actually has only 12.5 mm back focus from the front of the camera. I use a Newtonian and that 5mm is enough to get me perfectly spaced for my coma corrector. A subtle point but huge considering most cameras use that 17.5 mm back focus as standard.

OPT Telescopes QHY 268M Photographic Cooled Monochrome CMOS Camera Review
United States United States


I pre-ordered QHY268M at beginning of February and got it late March. Pretty fine for pre-order stuff tied to launch where quantity is limited.