I'd recommend the bulb setting, rather than manual. That way, you can time the shot. I've had erratic results with manual exposure and setting the shutter speed.


My experience has been that it's better to stop down to f/8. ISO 100, and no in-camera noise reduction.


The wide angle lens is preferred, since once you find the right "view," you'll probably not change it much.


Another thing: remove any UV filter on the lens.


Of course, use a sturdy tripod and a remote release cord.