QHY 268 M/C camera


Hig Resolution APS-C format – 16 bit – BSI – 26MP.


High Resolution APS-C format – 16 bit – BSI – 26MP.

Native 16-Bits  On-chip 16-bit A/D – 65536 Levels.

High Dynamic Range – 75ke full well – Vivid colors. 

Ultra-Low Read Noise  0.7e- Noise at High gain and 3.5e- Noise at Low Gain.

The QHY268 M/C PH is a cooled, back-illuminated, CMOS camera based on the Sony IMX571 sensor with native 16-bit A/D and 3.76um pixels. The Sony IMX571 sensor has on-chip 16-bit A/D for the 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 sampling error and low read noise.

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 QHY268 M/C PH has a superb full well capacity of 75ke-.

The QHY268 M/C PH has only 0.7 electrons of reading noise at the highest gain and 6.8 FPS at full resolution readout speed. One electron of reading noise means the camera can achieve an SNR>3 at only 4 to 6 photons. This is the 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.

By Jarrett Trezzo

M42 GREAT ORION NEBULA, by Jarrett Trezzo

Telescopes: Celestron Rowe-Ackermann Schmidt Astrograph 11″
Cameras: QHYCCD QHY268 M/C PH

By Jarrett Trezzo

IC 434 HORSEHEAD NEBULA, by Jarrett Trezzo

Telescopes: Celestron Rowe-Ackermann Schmidt Astrograph 11″
Cameras: QHYCCD QHY268 M/C PH

Back-Illuminated, High QE – Zero Amp-Glow – Extremely Low Dark Current

The back-illuminated Sony Exmor sensor has about twice the QE of similar front-illuminated sensors. The QHY268 M/C PH has a zero amplifier glow. In addition the dark current is only 0.0005e/pixel/sec @ -20C.

QHY268 M/C PH Back-Illuminated Camera

The QHY268 M/C PH 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 amplifier glow. 16-bit A/D gives a high-resolution sampling of the whole full well range. Digitizing 0-65535 levels yield a smooth image with a continuous gradation of greyscale levels.

Readout Mode is a new function for new QHY Cameras. Different Readout Mode has different driver timing etc and causes different performance results. Each readout mode has its advantage and disadvantages. QHY600 currently has three readout modes. And in the future QHYCCD may add more modes.

The Readout mode is 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.

QHY 268 camera with FW and OAG

  • Model: QHY268
  • Image Sensor: SONY APS-C CMOS Sensor IMX571
  • Sensor Type: Back Illuminated (BSI)
  • Pixel Size: 3.76um x 3.76um
  • Mono and Color PH Version Available
  • 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: 0.7e- High Gain, 3.5e- Low Gain (2.7e- to 5.5e- in extended full well mode)
  • Dark Current: 0.0005e/pixel/sec @ -20C 0.001e/pixel/sec @ -10C
  • Zero Amplifier 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: 17.5mm(±0.3)
    • Adapters included:
        • QHY268M: QHY Combo B1
        • QHY268C: QHY Combo D1
    • Adaptes not included but suitable:
        • QHY268M: QHY Combo B2 and B3
        • QHY268C: QHY Combo D2 and D3
    • For more information, please check the QHYCCD page


Camera version

Color, Monochrome

You may also like…