Hi,
It ended with a Canon 300 mm f/4 lens. With that I don't have to struggle to find a field flattener and the Canon 6D + 300 mm lens weight in at 2.2 kg. Together with this:
http://www.astrofriend.eu/astronomy/...er-tripod.html
I have a real portable equipment. But I'm not sure if my Astro Adventurer could handle this but have read that others have this to work. With a low readout noise and many short exposures the chance increase that it will work.
Then buy tickets down to Rhodes:
http://www.astrofriend.eu/astronomy/...nomy-cafe.html
We have summer in Sweden now but I can do some test with Moon as test object.
I can use this lens to daytime photography too.
Lars