QHY268 BSI Cooled Medium Size APS-C Camera
Ultra High Resolution, 26 Megapixels, APS-C format
QHY268 is a 26 Megapixel back-illuminated cooled color CMOS camera with 16-bit A/D and 3.76um pixels. The QHY268C is available in both a monochrome and a color version. The sensor size is 23.5mm x 15.7mm (28.3mm Diagonal)
The QHY268M is the first monochrome CMOS camera with an APS-C sensor. The chip has the same functions as the flagship QHY600M:
- USB Re-connection with 12V ON/OFF
- Extended Full Well and Multiple Read Modes
- Random thermal noise suppression
- 20Gb optical fiber transmission (PRO-Version, under development)
- 1GB / 2GB oversized DDR3 memory
- Large programmable FPGA (only PRO)-Version, under development
- Water-cooled option
By using the Sony IMX571 Back Illuminated Sensor, the price will be significantly lower. Th high-resolution cooled, monochrome APS-C Camera uses a 26 Megapixel Sony IMX571 Back Iluminated Sensor with 16-bit A/D and 3.76um pixels. The QHY268 will be available as photo version and pro version (under development). Image quality is identical between the two models.
Native 16-bit A/D, 65536 Levels
The QHY268 is the CMOS camera with native 16-bit A/D on-chip. The output is real 16-bits with 65536 levels. Compared to 12-bit and 14-bit A/D, 16-bit A/D provides higher sampling resolution. System gain is less than 1e-/ADU with low noise and no sampling error.
Full Well Capacity of 51ke- and > 80ke- in Extended Mode
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 3.76µm pixels the QHY268C has a full well capacity of 51ke- (44ke- PRO-Version). When binned 2x2 to 7.5µm the full well is 176ke- (only Pro model).
Ultra-Low Read Noise, < 1 Electron at High Gain
The QHY268 PHOTO Version (M and C) has less than one electron of read noise at high gain and 6 FPS high readout speed. The QHY268C PRO has only one electron of read noise at high gain and 6,8 FPS high readout speed.
One electron of read noise means the camera can achieve a SNR>3 at only 3 to 4 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.
Low Dark Current, TE Cooling, Round Body
The QHY268 has extremely low dark current using SONY's Exmor BSI CMOS technology. In addition, the camera uses QHYCCD's proprietary thermal noise reduction technology and 2-stage TE cooling to reduce the dark current noise to extremely low levels.
Best Match for RASA System
The round body and sensor size make this camera ideal for RASA and Hyperstar systems.
The Photographic and Professional Model of QHY268 M/c
Choose between three models: The Photographic Model QHY268 M/C PHOTO or the Professional Model QHY268C PRO. Image quality is identical between the two models.
Photographic Modell QHY268 M/C PH (PHOTO: Professional Model QHY268M**/C PRO:
- 6 FPS, full frame, 16-bit images
- 6.8 FPS, full frame, 8-bit image
- Support for ROI at higher frame rates
- 1 GByte DDR3 memory
- 2×10Gigabit optical fiber interface
- Programmable trigger in/out
- Advanced timing interface for GPS
- 6,9 FPS, full frame, 16-bit images
- Support for ROI at higher frame rates
- Customizable FPGA
- 2 GByre DDR3 memory
Two 5m double fibre optic cables and two optical fibre modules are included with the camera.
**The QHY268M Pro Version is expected to be available next year.
Readout Mode is a new function for the QHY cameras. Different Readout Mode have different driver timing etc and causes the different performance results. Each readout mode has its advantage and disadvantages. QHY600/QHY268 currently has three readout modes. And in future QHYCCD may add more modes. The Readout mode 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.
Further detailed information can be found the website of QHYCCD :
If you have any further questions, please send us an email to kontakt (at) baader-planetarium.de.
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