Location of Photo:
Co Durham, UK
Date/Time of photo:
29th March 2019
300mm Nikkor (f/4.5) plus x2 teleconverter (equivalent to 600mm, f/9)
A 34 minute exposure with 13s subframes of M51 with an effective lens of 600mm at f/9 (300mm plus x2 teleconverter). Stacked in DSS.Processed in GIMP and then FastStone (the latter giving the iso-contours).