I'm back again with another question. I'm also interested in shooting sunsets, night skies, sunrises, and the likes. When using the recommended settings from the cheat cards, I get an error message saying that the lighting is poor, and my shutter won't work - I'm guessing due to the error message. I'm able to get a decent and clear focus, just no actual photo. I've tried with both my 55mm (which I realize is useless for sky shots) and my 200mm and got the same problem both times. Thoughts?