A pair of meteorites, AKA shooting stars, streak through the northern Maine sky during the annual Perseid Meteor Shower.
If you want to cover a lot of sky, a 15mm fisheye lens on a full frame camera body is a great choice. Not as great of a choice is the max f/4 aperture the Canon EF 8-15mm f/4 L USM Fisheye Zoom Lens has. I used ISO 3200 for a 30 second exposure and still added some brightness during post processing.
Still, I like the results and have no regrets from using this sharp lens for this task.
Leveling a lens in the dark is tough. Leveling a fisheye lens is difficult even in daylight. The Canon EOS 5D Mark III's electronic level rocks in this situation.