In the photo below (awesome by the way) the photographer says that he used a 2 1/2 minute shutter speed with the Nikon D70s before sunrise. Isn't the longest shutter speed possible with the D70s 30 seconds or did he just bracket these shots with different shutter speeds and is calling the finished product 2 and 1/2 minutes?
[attachment 13778 255156.jpg]
[attachment 13778 255156.jpg]