Parkey, or anyone that cares.
Just in case you did not think of this then I am going to type this all out. It is not hard to figure out the Shutter that you need for those bulb shots if you do a little work.
First I suggest putting the camera in AV. Dial in the widest F stop that you have. See what the shutter suggestion is. Now if it is F4 at 8 seconds then you just manually count out the stops to f11 which would be three whole stops. From there you increase the shutter stops three WHOLE stops. That would take you from 8 seconds to 15, to 30, to 60 seconds.
So you see that the shot that you would take at f/4 and 8 seconds will be the exact same exposure at f/11 and 60 seconds.
*I bolded the word WHOLE when talking about shutter stops because your camera may be set in 1/3 or 1/2 shutter stops. So when you turn the dial from 8 seconds it might go to 10, and then 13, before going a full stop to 15.