blog:photography:night:2021_10_25

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blog:photography:night:2021_10_25 [2021/10/30 22:03] – johnblog:photography:night:2021_10_25 [2021/11/06 10:11] (current) – [Images] john
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 <imgcaption 1|EOS 200D, Tokina f/2.8, 11mm, ISO3200, 6 x 120 seconds, processed from RAW>{{:blog:photography:night:2021_10_25:final_2.jpg?550|}}</imgcaption><imgcaption 1|EOS 200D, Tokina f/2.8, 11mm, ISO3200, 1 x 120 seconds, uncorrected JPEG>{{:blog:photography:night:img_3759.jpg?550|}}</imgcaption> <imgcaption 1|EOS 200D, Tokina f/2.8, 11mm, ISO3200, 6 x 120 seconds, processed from RAW>{{:blog:photography:night:2021_10_25:final_2.jpg?550|}}</imgcaption><imgcaption 1|EOS 200D, Tokina f/2.8, 11mm, ISO3200, 1 x 120 seconds, uncorrected JPEG>{{:blog:photography:night:img_3759.jpg?550|}}</imgcaption>
  
 +There was a fairly lurid coloured moon this night, so I also switched out to my only other lens available my 105mm Sigma macro:
  
 +<imgcaption 1|EOS 200D, Sigma f/2.8, 105mm, ISO200, 1 x 1/60 seconds at f11, processed from RAW>{{:blog:photography:night:2021_10_25:img_3788.jpg?550|}}</imgcaption><imgcaption 1|EOS 200D, Sigma f/2.8, 105mm, ISO200, 1 x 1/60 seconds at f11, centre crop>{{:blog:photography:night:2021_10_25:img_3788_centre_crop.jpg?550|}}</imgcaption>
 ==== Image Processing Notes ==== ==== Image Processing Notes ====
  
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 {{:blog:photography:night:2021_10_25:rawtherapee-initial-exposure-settings.png?300|}} {{:blog:photography:night:2021_10_25:rawtherapee-initial-chromatic.png?300|}} {{:blog:photography:night:2021_10_25:rawtherapee-initial-exposure-settings.png?300|}} {{:blog:photography:night:2021_10_25:rawtherapee-initial-chromatic.png?300|}}
 +
 +//The chromatic aberration settings are likely particular to my lens which is of course in this case is the ultra-wide 11mm Tokina. At 11mm and f/2.8 it has quite bad chroma in the corners of the image. It would likely not need such aggressive settings stopped down, or at the other end of it's focal length (16mm).//
  
 **2. Save as TIFF, 16bit. Load into GIMP and apply gradient as below in the direction of any light pollution** **2. Save as TIFF, 16bit. Load into GIMP and apply gradient as below in the direction of any light pollution**
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 **4. Let ASTAP do the stacking, along with any dark, flat and bias images.** **4. Let ASTAP do the stacking, along with any dark, flat and bias images.**
  
-**5. In the resulting stacked image, if the star colours look //off//, try another stacking/colour de-mosaic algorithm, or try the 'Fix or correct image colours' option from the tools menu.**+{{:blog:photography:night:astap-stacking-settings.png?600|}} 
 + 
 +//For me, the best results were with the AstroSimple option and Sigma Clip stacking options as above.// 
 + 
 +**5. In the resulting stacked image, if the star colours look //off//, try another stacking/colour de-mosaic algorithm, or try the 'Autocorrect image colours' option from the tools menu.**
  
 **6. Export as TIFF from ASTAP and load back into your image editor of choice. I used Rawtherapee to do final image/colour enhancements; playing with the colour and black/white highlight balance.** **6. Export as TIFF from ASTAP and load back into your image editor of choice. I used Rawtherapee to do final image/colour enhancements; playing with the colour and black/white highlight balance.**
 +
 +{{:blog:photography:night:rawtherapee-final.png?600|}}
  • blog/photography/night/2021_10_25.1635627838.txt.gz
  • Last modified: 2021/10/30 22:03
  • by john