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en:ost:ccds:grunddaten [2021/03/17 22:40] – [ST-7 & ST-8] rhainichen:ost:ccds:grunddaten [2024/03/27 13:09] (current) – rhainich
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 Our newcomer, the QHY 600M is a CMOS camera that was developed especially for astrophotography. It is our new deep-sky camera and offers among other things a full format sensor, a very high quantum efficiency, a very low readout noise and a very low dark current. For this camera we also have an off-axis-guide and a filter wheel with 9 positions.  Our newcomer, the QHY 600M is a CMOS camera that was developed especially for astrophotography. It is our new deep-sky camera and offers among other things a full format sensor, a very high quantum efficiency, a very low readout noise and a very low dark current. For this camera we also have an off-axis-guide and a filter wheel with 9 positions. 
 +
 +As main camera for our two [[en:ost:spektrograph:grunddaten| spectrographs]] serves a QHY 268M. Furthermore we have a QHY 485C and a ZWO ASI174.
  
 ==== CCD Cameras ==== ==== CCD Cameras ====
  
-Furthermore, four CCD cameras (ST-7, ST-8, STF-8300M, ST-i) from SBIG (//Santa Barbara Instrument Group//) and one CCD camera (Skyris 445C) from //Celestron// are available. +Furthermore, four older CCD cameras (ST-7, ST-8, STF-8300M, ST-i) from SBIG (//Santa Barbara Instrument Group//) and one CCD camera (Skyris 445C) from //Celestron// are available. 
  
-The ST-7 and ST-8 are deep-sky cameras, but due to their relatively small field of view they are rarely used. The STF-8300M is used as main camera for our two [[de:ost:spektrograph:grunddaten|Spektrographs]]. +The ST-7, ST-8, and STF-8300M are deep-sky cameras, but due to their relatively small field of view they are rarely used currently. 
  
-The ST-i and the Skyris 445C are "planetary cameras" which allow very short exposure times. They are mainly used as guiding cameras (see e.g. [[de:ost:ccds:ccdops#Guiding|here]] or [[de:ost:ccds:maximdl#Guiding|here]]) in connection with the QHY 600M and the spectrographs. +\\ 
 +The ST-i, the QHY 485C, and the Skyris 445C are "planetary cameras" which allow very short exposure times. They are mainly used for solar observations or as guiding cameras (see e.g. [[de:ost:ccds:ccdops#Guiding|here]] or [[de:ost:ccds:maximdl#Guiding|here]]) in connection with the QHY 600M and the spectrographs.  
 + 
 +All cameras can be controlled via [[de:ost:ccds:maximdl| Maxim DL]]. For the SBIG cameras [[de:ost:ccds:ccdops| CCDOPS]] is also available as control software. We have dedicated a separate article to the [[en:ost:ccds:setup|assembly]] of some cameras.
  
-All cameras can be controlled via [[de:ost:ccds:maximdl| Maxim DL]]. For the SBIG cameras [[de:ost:ccds:ccdops| CCDOPS]] is also available as control software. 
 ==== Basic data ==== ==== Basic data ====
  
 ===  Main cameras === ===  Main cameras ===
  
- +[{{ :ost:ccds:qhy268m.jpg?300| Our QHY 268 }}] 
-/*|< 65% 20% 15% 15% 15%  - >|*/ +|< 100% 27%>| 
-|                                  |             **ST-7**                |             **ST-8**                  |              **STF-8300**                 |             **QHY 600M**                 | +|                                  |             **QHY 600M (2x)**             |             **QHY 268M**                  | 
-| **Model number**                 | ST-7XME-D                           | ST-8XME                               | STF-8300M                                 | QHY 600M PRO-L                       | +| **Model number**                 | QHY 600M PRO-L & QHY 600M PH              | QHY 268M-PH                               | 
-| **pixel size**                   | 9 $\mu \text{m}$ x 9 $\mu \text{m}$ | 9 $\mu \text{m}$ x 9 $\mu \text{m}$   | 5.4 $\mu \text{m}$ x 5.4 $\mu \text{m}$   | 3.76 $\mu \text{m}$ x 3.76 $\mu \text{m}$ | +| **pixel size**                   | 3.76 $\mu \text{m}$ x 3.76 $\mu \text{m}$ | 3.76 $\mu \text{m}$ x 3.76 $\mu \text{m}$ | 
-| **Number of pixels**             | 765 x 510                           | 1530 x 1020                           | 3326 x 2504                               | 9576 x 6388                              | +| **Number of pixels**             | 9576 x 6388                               | 6280 x 4210                               | 
-| **Total size of the chip**       | 6.9 mm x 4.6 mm                     | 13.8 mm x 9.2 mm                      | 17.96 mm x 13.52 mm                       | 36 mm x 24 mm                  | +| **Total size of the chip**       | 36 mm x 24 mm                             | 23.45 mm x 15.7 mm                        | 
-| **Field of view with the CDK20** | 6.9’ x 4.6’                         | 13.7’ x 9.2’                          | 17.9’ x 13.5’                             | 35.8’ x 23.4’                             | +| **Field of view with the CDK20** | 35.8’ x 23.4’                             | 23.3’ x 15.6’                             | 
-| **Sampling**                     | 1.9 Pixel per arcsec                | 1.9 Pixel per arcsec                  | 3.1 Pixel per arcsec                      | 4.5 Pixel per arcsec                    |+| **Sampling**                     | 4.5 Pixel per arcsec                      | 4.5 Pixel per arcsec                      |
  
 ===  Planetary/Guiding cameras === ===  Planetary/Guiding cameras ===
  
-[{{ :ost:ccds:ccd_klein.jpg?300| Our SBIG ST-8 }}]+[{{ :ost:ccds:qhy485c.jpg?300| Our QHY 485C }}] 
 +|< 100% 27%>| 
 +|                                    |              **Skyris 445**               |          **QHY 485C**                 |                **ST-i**                 |          **ZWO ASI174**               | 
 +| **Model number**                   | Skyris 445C                               | QHY-5-III-485C                        | ST-i monochrome                         | ZWO ASI174MM Mini                       |  
 +| **pixel size**                     | 3.75 $\mu \text{m}$ x 3.75 $\mu \text{m}$ | 2.9 $\mu \text{m}$ x 2.9 $\mu \text{m}$ | 7.4 $\mu \text{m}$ x 7.4 $\mu \text{m}$ | 5.86 $\mu \text{m}$ x 5.86 $\mu \text{m}$ | 
 +| **Number of pixels**               | 1280 x 960                                | 3864 x 2180                           | 648 x 486                               | 1936 x 1216                           | 
 +| **Total size of the chip**         | 6.26 mm x 5.01 mm                         | 11.2 mm x 6.3 mm                      | 4.8 mm x 3.6 mm                         | 11.3 mm x 7.1 mm                      | 
 +| **Field of view with the CDK20**   | 6.2’ x 5.0’                               | 11.2’ x 6.3’                          | 4.8’ x 3.6’                             | 11.2’ x 7.1’                          | 
 +| **Sampling**                       | 3.4 Pixel per arcsec                      | 5.8 Pixel per arcsec                  | 2.3 Pixel per arcsec                    | 2.9 Pixel per arcsec                  |
  
-|                                    |              **Skyris 445**               |                **ST-i**                 | +=== Cameras that are no longer in daily use === 
-| **Model number**                   | Skyris 445C                               | ST-i monochrome                         | + 
-| **pixel size**                     | 3.75 $\mu \text{m}$ x 3.75 $\mu \text{m}$ | 7.4 $\mu \text{m}$ x 7.4 $\mu \text{m}$ | +[{{ :ost:ccds:ccd_klein.jpg?300| Our SBIG ST-8 }}] 
-| **Number of pixels**               | 1280 x 960                                | 648 x 486                               | +|< 100% 27%>| 
-| **Total size of the chip**         | 6.26 mm x 5.01 mm                         | 4.8 mm x 3.6 mm                         | +|                                  |             **ST-7**                |             **ST-8**                  |              **STF-8300**                 | 
-| **Field of view with the CDK20**   | 6.2’ x 5.0’                               | 4.8’ x 3.6’                             | +| **Model number**                 | ST-7XME-D                           | ST-8XME                               | STF-8300M                                 | 
-| **Sampling**                       | 3.4 Pixel per arcsec                      | 2.3 Pixel per arcsec                    |+| **pixel size**                   | 9 $\mu \text{m}$ x 9 $\mu \text{m}$ | 9 $\mu \text{m}$ x 9 $\mu \text{m}$   | 5.4 $\mu \text{m}$ x 5.4 $\mu \text{m}$   | 
 +| **Number of pixels**             | 765 x 510                           | 1530 x 1020                           | 3326 x 2504                               | 
 +| **Total size of the chip**       | 6.9 mm x 4.6 mm                     | 13.8 mm x 9.2 mm                      | 17.96 mm x 13.52 mm                       | 
 +| **Field of view with the CDK20** | 6.9’ x 4.6’                         | 13.7’ x 9.2’                          | 17.9’ x 13.5’                             | 
 +| **Sampling**                     | 1.9 Pixel per arcsec                | 1.9 Pixel per arcsec                  | 3.1 Pixel per arcsec                      |
  
  
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 | **Filter position** |  1  |  2  |  3  |  4  |  5  |  6  |  7  |  8  |  9  | | **Filter position** |  1  |  2  |  3  |  4  |  5  |  6  |  7  |  8  |  9  |
 | **Filter**          |  H_alpha  |  OIII  |  SII  |  U  |  B  |  V  |  R  |  I  |  Clear  | | **Filter**          |  H_alpha  |  OIII  |  SII  |  U  |  B  |  V  |  R  |  I  |  Clear  |
-| **Comment** |  small band  |  small band  |  small band  |  broad band  |  broad band  |  broad band  |  broad band  |  broad band  | +| **Comment** |  narrow band  |  narrow band  |  narrow band  |  broad band  |  broad band  |  broad band  |  broad band  |  broad band  |  
 +The transmission curves of the UBVRI filters can be found at the web page of //Baader Planetarium//: [[https://assets.baader-planetarium.com/media/extendware/ewimageopt/media/inline/63/5/ubvri-bessel-filtersatz-photometrisch-1f1.jpg|Filter transmission]]. The transmission curves of the narrow band filter are similar to those of the STF8300.
  
 === ST-7 & ST-8 === === ST-7 & ST-8 ===
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 | **Filter position** |  1  |  2  |  3  |  4  |  5  |  6  |  7  |  8  | | **Filter position** |  1  |  2  |  3  |  4  |  5  |  6  |  7  |  8  |
 | **Filter**          |  Block-UV/IR (L)  |  Blue  |  Green  |  Red  |  H_alpha  |  OIII  |  V  |  B  | | **Filter**          |  Block-UV/IR (L)  |  Blue  |  Green  |  Red  |  H_alpha  |  OIII  |  V  |  B  |
-| **Comment** |  luminance  |  broad band  |  broad band  |  broad band  |  small band  |  small band  |  broad band  |  broad band  |+| **Comment** |  luminance  |  broad band  |  broad band  |  broad band  |  narrow band  |  narrow band  |  broad band  |  broad band  |
 The transmission curves of the new filters can be found at the web page of //Baader Planetarium//: [[https://www.baader-planetarium.com/blogs/english/wp-content/uploads/sites/2/2016/03/EN_l-rgb-c_filterkurve.jpg|Filter transmission]]. The transmission curves of the new filters can be found at the web page of //Baader Planetarium//: [[https://www.baader-planetarium.com/blogs/english/wp-content/uploads/sites/2/2016/03/EN_l-rgb-c_filterkurve.jpg|Filter transmission]].
  
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   * The Off Axis Guides of the STF-8300 and the QHY 600M have the advantage that they are placed in front of the respective filter wheel and therefore the guiding is independent of the brightness of the guide star in the respective filter. For this reason, these cameras can make use of fainter guide stars/objects in comparison to the ST-7 and ST-8.   * The Off Axis Guides of the STF-8300 and the QHY 600M have the advantage that they are placed in front of the respective filter wheel and therefore the guiding is independent of the brightness of the guide star in the respective filter. For this reason, these cameras can make use of fainter guide stars/objects in comparison to the ST-7 and ST-8.
  
 +==== Maintenance ====
 +
 +Every 12 months (or before) the desiccant cartouches of the cameras need to be regenerated (baked), otherwise there's the possibility that the cooled CCD sensors can suffer from icing due to moisture in the cameras. The desiccant cartouches of the ST-7 and ST-8 can be found at the bottom of the camera and can easily be released from the camera case with a screw driver. This procedure is even easier for the STF-8300, where the desiccant cartouche (located at one side of the camera) can be unscrew with two fingers. Attention! The connection between the camera cases and desiccant cartouches are secured by sealing rings that can easily fall off the cartouches and vanish inside the camera cases. To prevent water (vapor) from getting into the camera during the regeneration of its desiccant cartouche, remove the desiccant cartouche in a dry environment and replace it with one of the  dummies, which can be found in the room 2.009. It takes about four hours at 170°C in a common oven (without the sealing ring!) to regenerate the desiccant in the cartouche, so that the camera can work for another year without icing. 
 ====== DSLR ====== ====== DSLR ======
  
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 Furthermore, one can take full-HD videos with an ISO sensitivity of max. 6,400 (can be expanded up to 12,800). The camera can be controlled by a rotatable and slewable 7,7 cm LCD touchscreen or by a computer interface. Exposure series can be taken at a maximum speed of approx. 5 images per second, which can be maintained for about 22 exposures (JPEG format) or 6 exposures (RAW format). Furthermore, one can take full-HD videos with an ISO sensitivity of max. 6,400 (can be expanded up to 12,800). The camera can be controlled by a rotatable and slewable 7,7 cm LCD touchscreen or by a computer interface. Exposure series can be taken at a maximum speed of approx. 5 images per second, which can be maintained for about 22 exposures (JPEG format) or 6 exposures (RAW format).
 +
 +It is also possible to remotely control the camera [[en:dslr:tethered_shooting|by a computer]]. 
  • en/ost/ccds/grunddaten.1616020851.txt.gz
  • Last modified: 2021/03/17 22:40
  • by rhainich