On April 14th, Philipp Salzgeber was able to catch the ISS while passing in front of the sun. For this, he used a filter made from AstroSolar® Photo Film OD 3.8 (#2459278)
He kindly gave us the permission to repost his blog post from http://www.salzgeber.at/astrophotography/solar/iss-solar-transit.
As the ISS orbits our planet, from time to time it passes in front of the sun for a given location.
https://www.calsky.com and https://transit-finder.com/ allow you to predict such transits for your location.
On Saturday, April 14th 2018, such a transit happened, and I was able to capture it:
(Of course the sound is artificial!)
I used a 127mm refractor with a 2x teleconverter, shooting FullHD Video in DX crop mode on a Nikon D750.
Here are some images taken from the video, and a combination of all frames that captured the ISS: