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QHY QHY268 Monochrome Photographic APS-C CMOS Camera - QHY268M-PH

High Resolution ━━━━ 26 Megapixels APS-C format The QHY268M is a cooled, back-illuminated, CMOS camera based on the Sony IMX571 sensor with native 16-bit A/D and 3.76um pixels. The BFL of QHY268M is 12.5mm under a new front design.

Price Range: $2,399 to $2,748

Model QHY268M
Image Sensor SONY APS-C CMOS Sensor IMX571
Sensor Type Back Illuminated (BSI)
Pixel Size 3.76um x 3.76um
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 
75ke- or above in extended full well mode
Native 16-bit (0-65535 greyscale) A/D
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
Shutter Type Electronic Shutter
Computer Interface USB 3.0 
Built-in Image Buffer 1GByte DDR3 Memory
Cooling System
Two-stage TEC cooler
Less than 1S lower than ambient temperature -30C in continuous mode
More than 1S continuous mode or lower than ambient temperature -35C in single frame mode
Anti-Dew Heater
Humidity Sensor* QHY268M:Yes
Center inclination adjustment *  Yes
Extended Fullwell Mode*  Yes
2CMS Mode*  Yes
Telescope Interface*
QHY268M: Support M54 and M48 (with standard adapters ) 
Optic Window Type

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

Back Focal Length*
QHY268M: 12.5mm (with CAA)
If used with the QHY filter wheel, the actual calculated intercept is 12.5mm. The actual BFL (the intercept from the CMOS chip to the top of the camera) is 14.5mm. Since most uses will match CFW with monochrome cams, please take 12.5mm as major reference. Check the mechanical drawing below for details.
Note 14.5mm rear intercept does not include adapter thread, which must be used with adapters of various sizes through the top 6 screw holes.
PH Version:780g
Native 16-Bits

On-chip 16-bit A/D
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.

High Dynamic Range

75ke full welll
Vivd colors

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-.

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. Besides, QHY268M/C has a 2CMS mode, the readout noise can be better decreased under the Extended Fullwell Mode


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