en:ost:ccds:astrofotografie

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en:ost:ccds:astrofotografie [2021/03/15 09:52] – [Object selection] rhainichen:ost:ccds:astrofotografie [2021/06/21 13:16] (current) – [Photography with a DSRL] rhainich
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 ==== Filter choice ==== ==== Filter choice ====
-There are several different filters available for our cameras (see [[en:ost:ccds:grunddaten|here]]). Please note, that filters have transmission curves that absorb most of the photons, so the exposure times are getting (much) longer. Depending on the object, some filters are more useful then others. For emission nebulae, e.g., narrow band filters (H-Alpha/Beta, OIII) are especially useful. For stars und galaxies, broad band filters (U/B/V/R/I) mare usually more sense. To construct a (pretty) RGB image later on, best use the B, V, and R band filters. +There are several different [[en:ost:ccds:grunddaten|filters]] available for our cameras. Please note, that [[en:ost:ccds:grunddaten|filters]] have transmission curves that absorb most of the photons, so the exposure times are getting (much) longer. Depending on the object, some filters are more useful then others. For emission nebulae, e.g., narrow band filters (H-Alpha/Beta, OIII) are especially useful. For stars und galaxies, broad band filters (U/B/V/R/I) mare usually more sense. To construct a (pretty) RGB image later on, best use the B, V, and R band filters. 
    
 ==== Exposure times ==== ==== Exposure times ====
   * extend here -- maybe a small galery   * extend here -- maybe a small galery
-  * [[http://polaris.astro.physik.uni-potsdam.de/gallery/2015.05.21/ngc188_sample_inverted.jpg|40min exposure]] -- stars until  V $\sim $ 18mag can be observed+  * [[http://polaris.astro.physik.uni-potsdam.de/gallery/2015.05.21/ngc188_sample_inverted.jpg|40min exposure]] -- stars until  V $>$ 18mag can be observed
  
  
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     - attach (carefully!) the flatfield foil (from the lab room , 2.009) and switch it on (power supply in the locker in the dome)     - attach (carefully!) the flatfield foil (from the lab room , 2.009) and switch it on (power supply in the locker in the dome)
     - please note, the flatfield foil must evenly illuminate the whole aperture of the telescope     - please note, the flatfield foil must evenly illuminate the whole aperture of the telescope
-    - take a number of exposures with short exposure times (around 3 seconds), prevent the CCD from overflowing +    - take a number of exposures with short exposure times (around 3 seconds), prevent the camera chip from overflowing 
                      
 ==== Data reduction / Stacking ==== ==== Data reduction / Stacking ====
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 ===== Photography with a DSRL ===== ===== Photography with a DSRL =====
-We have a Canon EOS 700D, which is a digital (single) reflex camera (DSLR). This camera allows for very short exposure times (until 1/4000s), while our CCDs only allow for a minimal exposure time of 0.09s. Accordingly, this camera is useful for objects that require short exposure times. Please note that those objects need to be bright enough for such short exposure times. The field of view of the DSLR is larger compared to the other cameras (see [[en::ost:ccds:grunddaten|here]]). +We also have a Canon EOS 700D, which is a digital (single) reflex camera (DSLR). This camera allows for very short exposure times (until 1/4000s), while our CCDs only allow for a minimal exposure time of 0.09s. Accordingly, this camera is useful for objects that require short exposure times. Please note that those objects need to be bright enough for such short exposure times. The field of view of the DSLR is larger compared to the other [[en::ost:ccds:grunddaten|cameras]]. 
  
 Interesting objects are e.g.: Interesting objects are e.g.:
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           * the Moon           * the Moon
           * comets           * comets
 +
 +We also have an article on [[en:dslr:tethered_shooting|controlling DSLR cameras using a computer]] :-).  
 +
 +<WRAP center round info 60%>
 +**Our new camera, the QHY600M, is a CMOS camera and therefore also allows much shorter exposure times than the old CCD cameras and on the other hand does not have the disadvantages of a DSLR camera, such as a high dark current. More about this when we have more experience... :-).**
 +</WRAP>
  
 ==== Lucky imaging how-to ==== ==== Lucky imaging how-to ====
 This part will hopefully be filled soon... This part will hopefully be filled soon...
-===== Photography with the webcam =====+===== Photography with a video camera =====
      * we own one of these, too ;-)      * we own one of these, too ;-)
  
 \\ \\
 **To be continued...** **To be continued...**
  • en/ost/ccds/astrofotografie.1615801955.txt.gz
  • Last modified: 2021/03/15 09:52
  • by rhainich