Alrededores de la Flaming Star Nebula

  


En esta fotografía se puede observar los detalles en la constelación de Auriga, a la izquierda arriba hacia abajo la  nebulosa IC401 conocida por el nombre de "Flaming Star Nebula" , es una nebulosa de emisión y reflexión que rodea la estrella azul AE Aurigae. tenemos tambien la nebulosa IC410 abajo centro y a IC417 izquierda. Arriba en la esquina izquierda se puede ver el cumulo abierto de estrellas conocido como "starfish"

Fotografía captada el 25 de octubre 2019, Sierra norte de Sevilla, España, con el siguiente equipo y características:
Telescopio Superapocromático TMB 130/780 CNC II.
Reductor / aplananador Massimo Riccardi x0,75 de 81 mm.
Focal 585 mm a F4,5.
Montura Takahashi EM200 Temma2.
Cámara  COLD CMOS QHY 367C .
Guiado con la cámara principal, OAG con cámara QHY5 LII.
Temperatura sensor de - 10ºC
Exposiciones 10x 900". RGB, ninguna Ha
Software  SGPro, Pixinsight 1.8.4, CS 4.

➥ Fotografía en alta resolución

Review of COLDMOS QHY 367C ( English)


Hello, I will perform an analysis of the new specialized camera for Astrophotography of the manufacturer QHYCCD, it is the model COLDMOS QHY367, color "one shoot color" (OSC) and Full Frame with a resolution of 36 Megapixels. Use the same clip as the one used in the Nikon 810 camera.
  • CMOS Sensor: Sony IMX094 Color CMOS
  • CMOS Size: 36mm*24mm full frame
  • Pixel Size: 4.88um*4.88um
  • Resolution 5.984x3.366
  • Full Well: 56ke-
  • Shutter: Electric rolling shutter
  • Exposure Time: 60us-3600 sec
  • Max Frame Rate (for both 8bit and 14bit): 3.2FPS@Full Resolution.
  • AD Convert : 14BIT
  • Readout Noise: 3.2e@Low gain. 2.4e@unity gain
  • Maximum Dynamic Range: More than 17000. >14 STOP
  • Mechanical Interface: M54/0.75 female thread
  • Optic window heater: Yes
  • TEC 2-stage TEC: -35C below ambient
  • Optic Glass Window : AR+AR Clear glass
  • Silicon gel socket: Yes
  • Weight(Camera only): 788g
The technology of refrigerated CMOS sensors, are having better performance, achieved and surpassing the traditional CCD, in size, lower reading noise, higher fullwell (ability to capture photons) and lower cost, with excellent photographic results.

In addition, manufacturers are making, as in this QHY367C, the incorporation of more advanced electronics that incorporate intermediate DDR3 memory buffers that speed up complete discharges in less than 1 second and at lower power consumption.

SONY IMX094

UNBOXING

Coming directly from Hong Kong, the courier took the perfectly packaged package 3 days. Inside came the characteristic white box of QHYCCD illustrated with constellations. The camera body is cylindrical with a very good finish and quality in which the vision of full frame sensor (24x36mm) stands out. The cylindrical body is oriented for use in Hiperstar systems in catadrioptic telescopes.

The following items came in the box:

  • QHY 367C camera
  • Camera cover
  • Rotator ring adapter.
  • M54 adapter with 2 "barrel.
  • USB 3.0 cable
  • Cable and 6A 12V power supply to connect to 220V AC.
  • Extension cable with double Jack DC type connector, one of them with thread. for the camera.
  • Desiccant tube with silica bag.
A metal cover is missing that protects the sensor when it is already mounted with the OAG

CAJA QHYCCD
SE APRECIA EL SENSOR FULL FRAME 36X24MM



CUERPO QHY 367C
I also requested that they provide me with the following accessories.
  • 010094 QHYOAG-M
  • 020079 M54 (F) Medium spacer with 6 holes.
  • 020076 Spacer to install 2 "M56 filter Part A
  • 020077 Spacer to install 2 "M56 filter Part B
The OAG is an accessory used to mount a tracking camera type QHY5II, QHY5LII, using the same optical axis of the main telescope,

The spacers are used to ensure the distance required by the telescope's reducer / flattener and prevent spherical aberrations. They are composed of 6 spacers of different thicknesses to use the necessary ones to ensure the correct distance. The last two adapters are used to place in the middle of the two a 2 "filter, of the IR / IV type, anti pollution, narrow band.

Telescope installation is done using the M54 thread (H)

QHY 367C, QHY OAG Instalados. TMB 780/780 y Takahashi EM 200 Temma2
Closer View
PERFORMANCE 



Phase 1: Analysis of the Bias / darks

Taking a Bias shot at -10º bin1 the result is the one attached.
  • Uniformity of distribution without gradients
  • Low reading noise.

QHY 367C BIAS -10ºC
Similarly the Dark at.-10ºC, 900 seconds Bin1 has the same characteristics of low noise and uniformity, detecting a small Amp Glow on the left.

QHY 367C DARK -10ºC  900 SEG.

Phase 2: Black and White Analysis

In this phase I wanted to exploit the capabilities in black and white, for this I rely on using the Bin2 format. If it is true that with this format I will have a 1/4 of the resolution of the sensor format, which together with the bayer matrix, another 1/4 would have 2.3Mpx instead of 36.7 Mp, but I want to find out the performance in Sensitivity, resolution and thermal noise of this sensor. In this Bin2 being a color camera with an RGGB configuration of Bayer Matrix, when Debayeriza it becomes directly a Black and white photograph. I want to exploit the details and the appearance of artifacts, in black and white they are better appreciated.

The astronomical objective for the test has been intentionally a weak nebula with high emission content in Ha, in order to detect the limitations of the camera on very weak objects, specifically the NGC7822, emission nebula.

The data of the exhibits are: 13 exposures of 10 minutes to Bin2. That is 2.5 hours of effective exposure time, well below the more than 4 hours required at least in a monochrome camera for similar results.

EQUIPO
  • Takahashi EM200 Temma2
  • TMB superapocromatic 130/780 CNC II with a reducer at 585mm.
  • Pixinsight 1.8



The result of the image once processed highlights:

  • Even being a photograph of Bin 2, it has a high resolution without pixelation or loss of detail.
  • The stars appear punctual, even better to experience with monochrome cameras.
  • A very high sensitivity is BIn2, we will have to see the results at Bin1 and color.
  • High depth of field
  • Complete removal of artifacts in any part of the photograph, so it has not required aesthetic modifications.
  • In the process the noise elimination has been very slight
  • Complete absence of Amp Glow.
  • Calibrated with Darks, Bias, Flats with flat image results without residual gradients.

The high black and white performance makes the use of narrowband filters type Ha, Oiii, SII very viabl

Phase 3: Color results analysis

Finally, I present the final results made in another shooting session to Bin1, that is to say in full color and of the same object, slightly varying the framing.

11 exposures of 15 minutes, 2 hours and 45 minutes total capture., The equipment is the same.




  • No artifacts, dead spots or hot spots are detected throughout the photograph.
  • The color balance is very accurate, slight calibrations with a natural color balance have been needed.
  • Very smooth pain transitions.
  • The processing has been much simpler by eliminating the combination of RGB and luminance channels.
  • To take into account that the color calibration must be done with the result of stacking without stretching.
  • As can be seen, the detail is enormous, without differences to the results in a monochrome CCD.
As can be seen, the detail is enormous, without differences to the results in a monochrome CCD.

CONCLUSIONS  

I have had and used several monochrome cameras, SBIG ST8300, SBIG STT8300, SBIG STL11000, QHY 16200A, ... and so based on the experience I have, I can compare the results objectively with this camera.

The QHY 357C is a color of 36Mpx resolution, using a Bayer Mask, which means that starting the resolution of a final color photograph falls to 1/4 of 36Mpx, that is to say 9Mpx the equivalent of a monochromatic camera.

The results obtained have been a pleasant surprise because the resolution and resulting details are enormous !!!, with a high quality of colors, very soft, without gradients or artifacts.

The historical discussion between astrophotographers about the pros and cons of color cameras (OSC) versus monochromatic ones makes in this case meaningless, the high resolution of the QHY367C makes the final results, resolution, details, color balance similar or even superior, also adding more ease of use, cost and lower weight ...


I think that the experience acquired after many years of using monochromatic cameras has created some opinion prejudices against OSC cameras, but I was wrong. I can see that the COLDMOS QHY 357C is an excellent product, highly recommended for those astrophotographers who want more simplicity, without the complexity of adding a filter wheel, processed by RBG channel, longer collection and processing time.
    PROS
    • High resolution
    • Low reading noise
    • Low power consumption
    • Great field, full fame
    • Large capacity to capture light.
    • Quick download to the computer (approx. 1 second a 70Mb photo.
    • Simplicity
    • Shorter captures and processing time
    TO IMPROVE
      • The price is high, comparatively lower than a monochrome camera with filter wheel.
      • It is necessary to process in the bayerizado with some care to obtain good results.
      • As an improved aspect, it would incorporate a handle for easy handling and outdated safety.
      • Although the shots have to be increased in time, it is compensated by the absence of captures in each LRGB channel, time is gained and the total time needed is less.
      • It cannot be used for astrometry.
      • Limited for narrowband captures. Usable but loses resolution.






      Nebulosa NGC 7822 ( Primera luz de la QHY 367C )

        


      La nebulosa NGC 7822 situada en la conselación de Cefeo, es un complejo de formación estelar, con una nebulosa de emisión de hidrógeno alfa Sharpless 171 y joven cumulo de estrellas denominado Berkeley 59. Está a una distnacia de 3.000 años luz, teniendo estrellas no mas vieja de unos millones de años .

      Fotografía captada el 27 de septiembre 2019, Sierra norte de Sevilla, España, con el siguiente equipo y características:
      Telescopio Superapocromático TMB 130/780 CNC II.
      Reductor / aplananador Massimo Riccardi x0,75 de 81 mm.
      Focal 585 mm a F4,5.
      Montura Takahashi EM200 Temma2.
      Cámara   COLD CMOS QHY 367C .
      Guiado con la cámara principal, OAG con cámara QHY5 LII.
      Temperatura sensor de - 10ºC
      Exposiciones 11x 900".
      Software  SGPro, Pixinsight 1.8.4, CS 4.