The June 5, 2012 transit of Venus, taken from southern Alberta through thickening clouds, without any filter, for 1/8000s at ISO 100 with the Canon 60Da and 80mm A&M apo refractor at f/6, for 480mm focal length. The time from setup to shooting was minimal, as I chased into a clear hole in the clouds northeast of Calgary and pulled over on the highway to see and shoot the transit. Clouds moved in again rapidly, preventing a clear shot through a solar filter.
The Amazing Sky 