Mars Opposition Eve

Mars Opposition Eve

October 12th, 2020, 11:10 p.m. local time

Preparation, prior session notes, favorable whether, and a little luck all contributed to what I believe is my best Mars capture yet.

Knowing the forecast for the following evening was suspect at best, I decided to try photographing Mars.  It had been cloudy and raining in the afternoon, but almost miraculously cleared by 6 p.m.  The only true issue was the dampness in the air, and I was worried this would impact overall image quality, due to moisture on the primary mirror.  The sky was clear and, importantly, the wind was non-existent.

I leveraged my Mars imaging experience from the weekend, and chose, based on that session and my notes from Mars’s last opposition, to use ISO 800 and exposure 1/200.  Late into my session videos, as I was continually refocusing after sets of three to four videos each, I accidentally changed the exposure for one set to 1/160.  This set, combined with great focus, yielded the best of the lot.  All but one set was very good, but this, I think, turned out excellent.

Summary of my equipment, settings, and software used:

  • Telescope: Dobsonian reflector 254mm / 10″ (homemade)
  • Camera: Canon EOS Rebel SL3
  • Barlow: TeleVue Powermate x5 1.25″
  • Filter: Baader Neodymium 1.25″
  • Canon T ring and adapter
  • Relevant camera settings:
  • ISO 800
  • Exposure: 160
  • HD video at 60fps
  • Created from three videos of about 25s each, best 25-35% of frames
  • Software for post-processing:
  • PIPP
  • Autostakkert
  • Registax 6
  • PaintShop Pro for minor touch-ups


I write frequently about astrophotography, technology advice, and my other interests like science fiction. I have over 30 years of experience in computer programming, information technology, and project management.

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