QHY268M PH, BSI Cooled Medium Size APS-C Camera (Photo)

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QHY268M PH, BSI Cooled Medium Size APS-C Camera (Photo)

# 1931096

Regular Price: € 2,698.00

Special Price Incl. Tax: € 2,428.20

Price excl. German VAT tax (19%): € 2,040.50

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  • High-Resolution cooled, monochrome APS-C Camera uses a 26 Megapixel (6280 x 4210 incl. overscan and optically black pixels) Sony IMX571 Back Iluminated Sensor
  • Effective Pixel: 6252 x 4176 (23,45x 15,7mm, diagonal = 28,3mm)
  • With Native 16-bit ADC and 3.76μm pixels
  • Very low dark current (0.0005e/p/s@-20C), 0.001e/pixel/sec @ -10C
  • High Dynamic Range 60ke- Full Well at 3.76μm pixels,  > 87ke- in extended read out mode
  • Ultra Low Read Noise 2.0e- at highest gain
  • Maximum frame rate 6 FPS, 6,8 FPS at A/D 8 bit
  • 1 GByte DDR3 image Buffer
  • 4 selectable readout modes
  • Best Match for Celestron RASA and Hyperstar System
  • Use SONY's Exmor BSI CMOS technology and Electronic Rolling Shutter
  • Two-stage Thermoelectric Cooling ( 35 C below ambient)
  • USB3.0 interface
  • Also availabe as Color Version avaliable

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QHY268C Technical  Drawings

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

The 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 60 ke- to > 87 ke- Low Gain 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 >60ke-. By using one of the binning modes, this can be increased to > 87 ke-.

Ultra-Low Read Noise of less than 2 Electrons 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:
  • USB3.0
  • 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
  • USB3.0
  • 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 this year.

4 Selectable Readout Modi (#0 to # 03)

Readout Mode is a new function for the QHY cameras. Different Readout Mode have different driver timing etc and lead to the different performance results. Each readout mode has its advantages and disadvantages. QHY600/QHY268 currently has three readout modes. QHYCCD may add more modes in the future. 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.

Mode # 0

This is the standard readout mode for most applications. A a gain of 25 to 26, the readout noise is only about 7 from 2,5 e-. The readout noise is doesn't change much for a gain between 0 and 25 as well as for a gain between 26 and 60. That's why most users will probably chose either gain 0 or gain 26, because the full well capacity decreases at a higher gain than 26, as well as the dynamic range. At fast optics like f/2 (e.g. RASA), a gain of 0 will probably be most useful. For slower telescopes under a dark sky (and thus longer exposure times), gain 26 is recommended, so that you can profit of the lower readout noise.

# 1 – High-Gain-Mode

This mode is characterised by a low readout noise and a slightly smaller full well capacity. Just like in the standard mode #0, there is a sweet spot for high or low gain. In this mode, the readout noise goes from 3,5 e- to 1,5 e- between gain 55 and 56.

# 1 – Expanded Fullwell-Mode

This mode achieves the highes full-well-capacity. The readout noise is almost independent from the gain setting approximately always at 7 e-. The dynamic range is almost always between 13 and 14 f-stops.

Mode # 3

Mode # 3 is very similar to mode # 2, but at a constantly lower readout noise between 4,5 e- and 5,5 e- (instead of 7,5 e- in mode # 2).

Here are the plots for the different modes:

QHY268M/C System Gain For All Mode QHY268M/C Readout Noise For All Mode QHY268C Dark Current vs. TemperatureQHY268M/C Fullwell For All Mode QHY268M/C Dynamic Range For All ModeQHY268C QE RGB

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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Additional Information

Manufacturer QHYCCD
Manufacturer SKU (#) QHY268PH M
SKU (#) 1931096
EAN Code 4047825103604
Net weight (kg) 0.98
Sensor Typ Back Illuminated
Sensor SONY IMX571 APS-C BSI CMOS Sensor
Sensor Size APS-C Format
Sensor Diagonal 28,3 mm
A/D Conversion Native 16-bit
Resolution 6280*4210 (includes the optically black area and overscan area)
Pixel Size 3.76um x 3.76um
Back Focus Distance 17.5mm(±0.3)/ Mono-Version 12,5mm (±0.5)
Exposure Range 30us - 3600sec
Full Well Capacity > 60ke- bis > 87ke- (depending on the readout mode)
Read Noise (RMS) 2,0 to 3,5 e- (High Gain), 4,5 to 7,5 e- (Low Gain)
Dark Current @ -20C 0.0005e-/p/s @ -20C, 0.001e-/p/s @ -10C
Built-in image Buffer 1 GByte DDR3 memory
Maximum Frame Rate Full Resolution 6.8FPS @8BIT, 6FPS @16BIT
User Interface USB 3.0
Cooling Dual Stage TEC cooler(-35C below ambient)
Optical Window AR+AR High Quality Multi-Layer Anti-Reflection Coating
Shutter Electronic Rolling Shutter
Included Accessories Power supply included in the scope of delivery
Telescope connection M54/0.75

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Christoph Kaltseis 69/03/2021 11/03/202109:45
  • Rating:
Digging in the Dark
IC443 + IC444 - Graben in der Dunkelheit -I (1st mit StarNet)
Das Rezept dazu: Rasa 11 f2.2, QHY 268M, Baader UFC + UFC Tilter + Baader f2 Highspeed Ultra Narrowband H-alpha 3,5nm, CGX + 462C als Guider. Mit 180sec pro Bild war das Ziel - die Tiefe maximal herausholen – weil die Daten es hergeben und keinen Marathon der durch die langen Zeiträume der Belichtung und die damit verbunden Bedingungen diktiert wird.
Dazu dann einfache Daten Reduktion, wobei die Feldausleuchtung keine Flats zwingend verlangte. Das Ergebnis des Rezepts: 23x 180s = 66min für die H-Alpha Information und die OIII ist soweit fertig; Das BiColor folgt und das natürliche Verhältnis zwischen Ha und OIII ist dramatisch! Dramatisch – ich mag es
  • Top Kamera! Was will man mehr???
  • nichts
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