The QHY268M/C 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
On-chip 16-bit A/D
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
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
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
Extremely Low Dark Current
back-illuminated Sony Exmor sensor has about twice the QE of similar front
illuminated sensors. The QHY268M/C has zero amplifer glow. In addition the dark
current is only 0.0005e/pixel/sec @ -20C.
2GB Image Buffer
In order to get smooth uninterrupted high speed transfer of
data, the QHY268M/C has a large 2GByte DDR3 memory buffer.
USB3.0 interface. 6.8FPS
Best Match for HyperStar System
The small pixels and round camera body of QHY268M/C plus
the APS-C size sensor make the QHY268M/C an ideal match for the HyperStar and
RASA optical systems.