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Orion's Belt, DSLRa

Processing Details

PixInsight

DynamicCrop on the master calibrated and registered (star-aligned) light frame.

Background Noise Reduction with AutomaticBackgroundExtractor.

Manual stretch with HistogramTransformations.

Noise reduction with ACDNR.

Lightness: Lightness mask

Noise reduction was performed with MultiscaleLinearTransform. 4 layers with the following settings (R as default):

  • Layer 1: Threshold 1.000, Amount 0.50, Iterations: 1

  • Layer 2: Threshold 1.000, Amount 0.50, Iterations: 1

  • Layer 3: Threshold 1.000, Amount 0.50, Iterations: 1

  • Layer 4: Threshold 1.000, Amount 0.50, Iterations: 1

Further noise reduction was applied with ACDNR and StdDev of 0.6 and Amount 0.50.

Star Reduction was applied with StarMask at 0.04000 Noise threshold, Scale 6 and Structure Growth as 0, 1 and 2 (Large-scale, Small-scale and Compensation).

Curves Transformations were applied to boost RGB/K and Saturation.

Photoshop

Selective Sharpening with High Pass Filter (radius 1.6).

Tech Card

Dates / Locations

10th November 2018, Exmoor, GMT+0, United Kingdom, TEMP: 8C, HUM: 96%, Bortle Class 3 ~SGM: 21.75 mag./arc sec2

14th, 16th, 28th & 30th January 2019, Bedworth, GMT+0, United Kingdom, Bortle Class 5 ~SGM: 19.57 mag./arc sec2

Equipment

Camera: Nikon D810A

Imaging Telescope: Takahashi FS-60CB

Correcting Lens: Takahashi Reducer 0.72x (composite focal length at 264mm and focal ratio at f/4.9)

Mount: iOptron CEM25EC

Image Quality

14 bit RAW (NEF)

Exposure time per image / number of composities and sensitivity

ISO 400 12 x 120" subs

ISO 400 77 x 180" subs

ISO 40, 5 x 240" subs

ISO 1600, 10 x 60" subs

ISO 1600, 8 x 180" subs (Bortle 5)

ISO 3200, 1 x 180" sub (Bortle 5)

Total Integration Time

5hrs 42mins

Calibration Frames

23 Darks, 23 Bias, 25 Flats

Software

PixInsight 1.8 Core

Photoshop