The QHY268M is the baby brother to the extreme QHY600M. Its IMX571 sensor featuring similar technology in the smaller APS-C format. Like the IMX455, the 571 is back illuminated (increased sensitivity and no residual bulk image) and natively 16bit for wide dynamic range. The small 3.76µm pixels provide high resolution and are well matched to shorter focal lengths scopes typically used for wide field imaging. Its physical format also make it an ideal combination for use with FASTAR equipped SCT's and the latest RASA systems.
Combined with zero amp glow and a heated chamber window, the QHY268M is the state of the art in performance for the APS-C format.
As with all QHY Mono cameras, the QHY268M features a dedicated connector for driving a QHY filter wheel.
Short Back Focus
The QHY268M features a very short back focus design of only 12.5mm. This allows a QHY filter wheel to be bolted directly to the face of the camera. This feature allows systems needing 55mm back focus to be created that include a QHY filter wheel AND Off Axis Guider. It also permits you to use Camera lens based systems as short as 44mm with a filter wheel (but no OAG). See the above images for examples of connectivity.
Specifications
Model QHY268M
Sensor SONY IMX571 APS-C CMOS Sensor
AR Coating On CMOS chamber Yes. Multi-layer AR coating
Pixel Size 3.76µm x 3.76µm
Effective Pixel Area 6280 x 4210 pixels (inc overscan)
Effective Pixels 26 megapixels
Effective Image Area 23.5mm x 17.5mm
Fullwell 51ke- (75ke- + in extended mode)
AD Sample Depth 16 Bit
Full Resolution frame rate 6 FPS@16BIT
2048 lines 11.5 FPS@16BIT
1080lines 19.5 FPS@16BIT
768lines 25 FPS@16BIT
480lines 34 FPS@16BIT
Readout Noise 0.7e-@ High gain / 3.5e-@ Low gain
Dark Current 0.0005e/pixel/sec @ -20C
Exposure Time Range 30us-3600sec
Anti-Glow Control Yes, Zero Glow
Shutter Type Electric Rolling Shutter
Computer Interface USB3.0
Built-in Image Buffer 1GB / 2GB DDR3 Memory
Cooling System Dual Stage TEC cooler（-35C° below ambient)
Anti-Dew Heater Yes
Silicon Gel Socket Yes
Telescope Interface QHY Hole Pattern with optional front face adaption.
Optical Window Type AR+AR High Quality Multi-Layer Anti-Reflection Coating (Camera needs a UV/IR filter in the light path)
Back Focal Length 12.5mm from face
Weight TBA
Power Consumption ~ TBA
