International Space Station

The ISS crossing the Sun on 15th August 2017. Taken using a C90 . I have taken a snapshot every 0.2s from the video file and merged them in PSP.


Mosaic of 3 manual exposures of the ISS as it passed over on the 31st July 2016


ISS taken on 31st July 2016 as it passed Vega, using a Samyang 14mm lens.


I┬átried to get a decent image of the ISS using my C90 for several months. The results were….varied.

This one is the best:

The ISS taken through a Celestron C90 telescope on 5th April 2016, using a 2x Barlow and a Canon EOS. The exposure is 1/400s at ISO 1600


Previously I wasn’t using the barlow, largely because I thought it would make the manual tracking of the ISS even harder than it already was. The problem is that without the barlow, the 1250mm focal length C90 gave an image scale that was just too small and pixelated when the image was zoomed (and zoomed and zoomed).

And this was a good result at that image scale….

The ISS on 15th March 2016 using a Celestron C90 (without a Barlow). The ISO was 1600 and the exposure 1/320s

So, my top tips are:

  1. Use a finder that is precisely aligned – I use a Telrad;
  2. Before the pass focus the scope/camera until you are bored of focusing, using a star and a Bahtinov mask;
  3. Use a cable release
  4. Set maximum ISO
  5. Try a range of exposures during the pass.
  6. Get most frames when the ISS is at high elevation.
  7. Set the mount friction to allow a smooth motion.

Have a go!

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The Night Sky above Somerset