Nick James writes:
“This is my first attempt at an ISS solar transit. I used Calsky for the track details and set up a portable system around 1km from the centreline just north of here. This used a Megrez 72mm refractor with a x2 Barlow and a Canon EOS550D running in HD video mode (1920×1080) at 30 frame/s. This image is the result of minimum stacking 45 video frames.
This wasn’t a very good pass since the ISS was a long way away (it can be twice this size at its closest) and I will try to use a longer focal length next time but it demonstrated that the Calsky predictions are right on.”