QHY268 BSI Cooled Medium Size APS-C Camera

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QHY268 BSI Cooled Medium Size APS-C Camera

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€ 2,370.00 Price excl. German VAT tax (19%): € 1,991.60

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  • High-Resolution cooled, APS-C Camera uses a 26 Megapixel (6280 x 4210 incl. overscan and optically black pixels) Sony IMX571 Back Iluminated Sensor
  • Effective usable Pixel: 6252 x 4176 (23,5 x 17,5 mm, d = 28,3 mm)
  • 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 51ke- Full Well at 3.76μm pixels, > 75ke- at extended mode
  • Ultra Low Read Noise 0.7e- at highest gain and 6/6.8 FPS at full resolution readout speed
  • Internal 1/2 GByte DDR3 image Buffer
  • Best Match for Celestron RASA and Hyperstar System
  • Use SONY's Exmor BSI CMOS technology and Electronic Rolling Shutter
  • Firmware (FPGA) Remotely upgrade via USB Port
  • Exposure Time from 30µs up to 3600 Seconds
  • Two-stage Thermoelectric Cooling (35 C below ambient)
  • internal Anti Dew Heater
  • Build-in total 64MByte Flash Memory. 10MBytes user-accessible space for stellar ROI frames for analysis for exoplanet investigation, occultations, atmospheric seeing measurements, focus, optical analysis, etc. Supports 100*100 image x 500 frames; 50*50 image x 4000frames; 25*25 image x 16000 frames; 10*10 image x 250000 frames .
  • Support for ROI at higher frame rates
  • Telescope Connection M54 x 0.75mm
  • Color Version and Mono Version avaliable
  • Available in three versions:
    • Photographic Model QHY268 M / C PH (PHOTO) with USB 3.0 interface
    • Professional Model QHY268 C PRO. The professional version also has two 2x10 Gigabit Fiber port to support the fiber connection and additional several trigger inputs
  • Please select the appropriate QHY268C camera for further technical details from the Drop-Down menu below

User's review by Jarrett Trezzo:

User's review QHY268C

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€ 2,370.00 Price excl. German VAT tax (19%): € 1,991.60

Product Questions

What is the expected availability date for the QHY268M-PH model?
Question by: Tonny Vanmunster on Dec 17, 2020 1:19:00 AM | 1 Answer(s)


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

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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Christoph Kaltseis 61/03/2021 03/03/202108:29
  • Rating:
Rosetta - SHO - Baader UNB´s f2 - in 118min
Simply Heaven Object – ein SHO Paletten Bild vom Rosetta Nebel
Es läuft nicht immer alles einfach und spätestens dann wird es interessant. Eine neue Kamera, neue Adaption, neues Guiding, neue finale (Serien) Schmalbandfilter und mit der Mischung aus der Wetter Situation sowie leichtem Ostwind bei -10 Grad Celsius…
So passiert alles was möglich war, Abstände waren nicht korrekt, Justierung verstellt, … Nachdem dann alles geschafft war, die Finger tief rot und taub… der erlösende Download. (fast zufrieden, für heute war es genug – ich wollte einen Datensatz in SHO)
QHY 268M / Baader UNB-Filter / Baader UFC-Tilter - am RASA 11 + Celestron CGX + QHY 462C als Autoguider im Vario Finder = Rock´n Roll!
In der Woche zuvor, hat mir Baader den endgültigen Prototypensatz der UNBs zur Qualitätsprüfung geschickt. Zusammen mit dem brandneuen QHY 268M bilden sie ein perfektes Paar! Ich nenne sie UNB, und Baader sagt dazu: Baader Ultra-Narrowband f/2 Highspeed-Filter (H-alpha 3,5nm / O III 4 nm / S II 4 nm)
Baader hat diese Filterbreiten nach langer Überlegung gewählt. Sie ermöglichten mir eine perfekte Farbbalance bei völlig gleichen Belichtungseinstellungen.
12x180Sekunden auf jedem Filter, mit dem RASA 11. 36 Minuten pro Kanal - schneller habe ich es nie geschafft.
Ich schätze, viele Leute warten auf die QHY 268M – die Kamera ist in meinen Augen ein Game Changer und die Filter auch. Im April 2021 können die UNB´s Filter und UFC Tilter verfügbar werden.
Baader UFC Tilter -> Nicht zu vergessen! Ich kann jetzt kippen – mühelos - wie einem Augenzwinkern. (die Anleitung ist geschrieben, damit die Justage recht einfach gehen wird)
Im zweiten Bild ist die ganze Baader UFC Adaption zu sehen und die Adaption enthält auch einen Prototyp eines Baader-UFC-Kameratilters.
Beste Grüße und viel Freude! Ihr Christoph Kaltseis
  • Alles :-)
  • Nichts
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