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QHY600M-PH Ultra Short BFL CMOS IMAGER



With the advantage of low readout noise and high-speed readout, CMOS technology has revolutionized astronomical imaging.  A monochrome, back-illuminated, high-sensitivity, astronomical imaging camera is the ideal choice for astro-imagers.

The QHY600 uses the latest SONY back-illuminated sensor, the IMX455, a full frame (35mm format) sensor with 3.76um pixels and native 16-bit A/D.  This sensor isQHY600M-Lg available in both monochrome and color versions.  The QHY600 ends the days of non-16bit CMOS cameras and it ends the days non-full frame (and larger) monochrome CMOS cameras.

 

Equipped with a Sony IMX455, the QHY600 is a back-illuminated Scientific CMOS Camera with extremely low dark current (0.002e/p/s@-20C) using SONY’s Exmor BSI CMOS technology. QHY600 is also a zero amplifer glow camera.

The QHY600 has only one electron of read noise at high gain and full resolution and 4FPS 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, time domain astronomy, fluorescence imaging, DNA sequencing and microscopy.

 

2GB DDR3 image buffer

In order to provide smooth uninterrupted data transfer of the entire 60MP sensor at high speed, the QHY600 has 2GB DDR3 image buffer. The pixel count of the latest generation of CMOS sensors is very high resulting in greater memory requirements for temporary and permanent storage.  For example, the QHY600 sensor produces about 120MB of data per frame.  The data band-width is also increased from the original 16-bits to the current 32-bits.  Transferring such a large file sizes necessarily requires the camera to have sufficient memory. The QHY600 has adopted a large-capacity memory of up to 2GB.  Data throughput is doubled. This large image buffer meets the needs of high-speed image acquisition and transmission of the new generation of CMOS, making shooting of multiple frames smoother and less stuttered, further reducing the pressure on the computer CPU.

Another advantage is that when using some computers that do not have fast processors or have poor support for USB 3.0, the computer can’t transfer high-speed data well, and the data is often lost. The DDR can buffer a lot of image data and send it to the computer. Even if the USB 3.0 transmission frequently gets suspended, it will ensure that data is not lost. There are options in SharpCap to turn DDR buffering on or off. The current version of the ASCOM driver works in DDR mode.

 

Extended Full Well Capacity and Multiple Read Modes

With a pixel size of 3.76um, these sensors already have an impressive full well capacity of 51ke.  Nevertheless, QHYCCD has implemented a unique approach to achieve a full well capacity higher than 51ke- through innovative user controllable read mode settings.  In extended full well readout mode, the QHY600 can achieve an extremely large full-well charge value of nearly 80ke- and the QHY268C can achieve nearly 75ke-.  Greater full-well capacity provides greater dynamic range and large variations in magnitude of brightness are less likely to saturate.  The QHY600 / 268C have three readout modes with different characteristics.

 

 

Native 16 bit A/D

The new Sony sensor has 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, a 16-bit A/D yields higher sample resolution and the system gain will be less than 1e-/ADU with no sample error noise and very low read noise.

 

BSI

One benefit of the back-illuminated CMOS structure is improved full well capacity. This is particularly helpful for sensors with small pixels.In a typical front-illuminated sensor, photons from the target entering the photosensitive layer of the sensor must first pass through the metal wiring that is embedded just above the photosensitive layer. The wiring structure reflects some of the photons and reduces the efficiency of the sensor.

In the back- illuminated sensor the light is allowed to enter the photosensitive surface from the reverse side. In this case the sensor’s embedded wiring structure is below the photosensitive layer. As a result, more incoming photons strike the photosensitive layer and more electrons are generated and captured in the pixel well. This ratio of photon to electron production is called quantum efficiency. The higher the quantum efficiency the more efficient the sensor is at converting photons to electrons and hence the more sensitive the sensor is to capturing an image of something dim.

 

Zero Amplify Glow

This is also a zero amplifer glow camera.

 

TRUE RAW Data

In the DSLR implementation there is a RAW image output, but typically it is not completely RAW.  Some evidence of noise reduction and hot pixel removal is still visible on close inspection.  This can have a negative effect on the image for astronomy such as the “star eater” effect.  However,  QHY Cameras offer TRUE RAW IMAGE OUTPUT and produces an image comprised of the original signal only, thereby maintaining the maximum flexibility for post-acquisition astronomical image processing programs and other scientific imaging applications.

 

Anti-Dew Technology

Based on almost 20-year cooled camera design experience, The QHY cooled camera has implemented the fully dew control solutions. The optic window has built-in dew heater and the chamber is protected from internal humidity condensation. An electric heating board for the chamber window can prevent the formation of dew and the sensor itself is kept dry with our silicon gel tube socket design for control of humidity within the sensor chamber.

 

Cooling

In addition to dual stage TE cooling, QHYCCD implements proprietary technology in hardware to control the dark current noise.

 

 

 

Specifications
Model QHY600PH (Photographic Version)
QHY600L (Lite Version)
COMS Sensor SONY IMX455
Mono/Color PH version:Both Available

 

L version: Mono Only

FSI/BSI BSI
Pixel Size 3.76um x 3.76um
Effective Pixel Area 9576*6388

 

(9600*6422 with overscan and optically black area)

Effective Pixels 61.17 Megapixels
(effective area.
Sensor Size Full Frame 36mm x 24mm
A/D Sample Depth

 

 

16-bit (0-65535 levels) at 1X1 binning

 

18-bit at 2X2, 19-bit at 3X3, 20-bit at 4X4 software binning

*QHY600 uses the software digital binning for 2*2binning. With digital sum, 2*2binning will be four 16-bit summed then it is 18-bit.

Full Well Capacity (1×1, 2×2, 3×3) Standard Mode
>51ke-  / >204ke- / >408ke-
Super Full Well Mode
>80ke-  / >320ke- / >720ke-
Full Frame Rate USB3.0 Port Image Transfer Speed

 

Full Frame Size: 4.0FPS (8-bit output)

Full Frame Size: 2.5FPS (16-bit output)

7.2FPS at 9600×3194, 22.5FPS at 9600×1080, 28FPS at 9600×768, 47FPS at 9600×480, 160FPS at 9600×100,

Fiber Port Image Transfer Speed (QHY600Pro only)

Full Frame Size: 4.0FPS (16-bit output)

Readout Noise 1.0e- to 3.7e-  (Standard Mode)
Dark Current 0.0022e-/p/s @ -20C    0.0046e-/p/s @ -10C
Exposure Time Range 40us – 3600sec
Unity Gain* 25 (Extended Full Well Mode) *

 

*With the improvement of the CMOS technology, the 16bit CMOS camera has been released, like QHY600/268/411/461. For these cameras, even in lowest gain it has beyond the requirement of unit gain (less than 1e/ADU due to sufficient samples) So you can directly set gain0 as start. Please note QHY600/268C/411/461 has extend full well mode. In this mode you still need to find out the unit gain position.

Amp Control Zero Amplifer Glow
Firmware/FPGA remote Upgrade Supported. Via Camera USB Port
Shutter Type Electric Rolling Shutter
Computer Interface USB3.0
Built-in Image Buffer DDR3 memory

 

PH&Pro Ver: 2GBytes(16Gbit)
Lite Ver: 1GBytes(8Gbit)

Hardware Frame Sequence Number Supported
Cooling System Dual Stage TEC cooler:
– Long exposures (> 1 second) typically -35C below ambient
– Short exposure (< 1second) high FPS, typically -30C below ambient
Optic Window Type AR+AR High Quality Multi-Layer Anti-Reflection Coating
Anti-Dew Heater Yes
Telescope Interface M54/0.75
Back Focal Length 17.5mm (±0.2)
Weigth PH Version: 850g*
Lite Version: 790g** M54/0.75mm center/tilt adjust adapter not included)
Power 40W/100%
20W/50%
13.8W/0%

 

Similarly, there’s only QHY600M as full frame mono CMOS camera. For QHY600, the best match is CFW3L and OAGM. If you have special requirement for short back focal length, like using Canon EF Lens (44.1mm BFL), Nikon F Lens (46.5mm), or using 55mm MPCC with both CFW and OAG, we recommend QHY600 Short BFL version as the only choice.

Model BFL Consumed Filters Supported
QHY600M PH/Lite 17.5mm 7 position, 2inch mounted/50mm unmounted
QHY600M SBFL 12.5mm
CFW3L 21.5mm
OAGM 10mm


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