North America and Pelican Nebulae Super Widefield, 2021

Cygnus

The North American & Pelican nebulae separated by a dark cloud, 1,500 light years away. I captured their light for 2 hours on 2 bright and short July nights using my fastest astrograph Takahashi FSQ-85ED reduced unguided and a Nikon D810A.

Capturing the Light

Here in UK, summer nights are bright and short so I had to be very quick. For that reason, my FSQ-85ED was equipped with its dedicated reducer making it a f/3.8 astrograph. No guiding was used as the encoders of the CEM25EC mount can handle the 3 mins exposures I used fine.

Processing Details

PixInsight

  • ImageCalibration

  • Debayer

  • StarAllignment

  • DynamicCrop

  • ScreenTransferFunction

  • HistogramTransformation

  • BackgroundNeutralization

  • ColorCalibration

  • MultiscaleLinearTransform

  • CurvesTransformations

Lightroom

  • Initial post processing

Photoshop

  • Further post processing

Tech Card

Date / Location

15th & 16th July 2021, Warwickshire, GMT+0, United Kingdom, TEMP: 20C, Bortle Class 4 ~SGM: 21.20 mag./arc sec2

Equipment

Camera: Nikon D810A

Imaging Telescope: Takahashi FSQ-85ED

Correcting Lens: Takahashi Reducer-QE 0.73x (composite focal length at 328mm and focal ratio at f/3.8)

Mount: iOptron CEM25EC

Image Quality

14 bit RAW (NEF)

Exposure time per image / number of composities and sensitivity

ISO 1250, 40 x 180" subs

Total Integration Time

2hrs

Calibration Frames

16 Darks, 16 Bias, 24 Flats

Software

PixInsight 1.8.8-8

Lightroom

Photoshop