The Seven Sisters, Pleiades, 2019

The magnificent star cluster Pleiades, also known as The Seven Ancient Greek Sisters and Subaru in Japan, is a collection of young and bright stars that currently pass through interstellar cosmic dust. It will take them several tens of thousands of years to move past this dust.

Capturing the Light

I traveled 45 minutes last week to find a dark sky on the borders of Oxfordshire and Warwickshire, it was one of the coldest nights this Autumn. The lights were captured unguided (manual dithering method), target was manual focused.

Processing Details


  • ImageCalibration

  • Debayer

  • StarAllignment

  • DynamicCrop

  • ScreenTransferFunction

  • BackgroundNeutralization

  • ColorCalibration

  • SCNR

  • HistogramTransformation


  • CurvesTransformations


  • Post processing and image rotation


  • Final touches

Tech Card

Date / Location

29th November 2019, Oxfordshire, GMT+0, United Kingdom, TEMP: -2C, Bortle Class 4 ~SGM: 21.29 mag./arc sec2


Camera: Nikon D810A

Imaging Telescope: Takahashi FSQ-85ED

Correcting Lens: Takahashi Flattener 1.01x (composite focal length at 455mm and focal ratio at f/5.4)

Mount: iOptron CEM25EC

Image Quality

14 bit RAW (NEF)

Exposure time per image / number of composities and sensitivity

ISO 2000, 8 x 240" subs

Total Integration Time


Calibration Frames

12 Darks, 20 Bias, 20 Flats


PixInsight 1.8 Core