Thankjs Bart.
I've had one "successful" ISS crossing of the sun:
http://www.iceinspace.com.au/forum/s...ad.php?t=63351. I use
www.calsky.com to calculate when the ISS will cross the sun or moon for my location. Calsky sends me an email during the week leading up to the event so I can plan for it.
I learned enough from the first crossing to know that I have to significantly reduce my exposure time to capture the ISS (it was blurred at 1/66s), so the plan for the next event is the bump up the gain and reduce the exposure time as much as possible for the ISS pass, and then mask it over a Ha image of the sun taken just before or after.
That's the theory anyway
...
Al.