So I'm at an informal meeting with my photographer buddies when somebody noticed the sunset happening outside the window.
Did any of us have our camera bags? Did any of the camera bags have the full kit?
One of us had a Canon camera.
One of us had a Nikon flash.
News flash: in manual mode a Nikon SB-800 will work just fine on a Canon 30D.
Shot with a 30D & 24-105 at 24mm, f8, 1/80th, iso 200, full power flash, fired with the built-in timer.