This is an 8 second exposure at ISO 800. I was using my headlights to see the settings on my camera and decided to see what would happen if I left the lights shining out across the lake. I was suprised to see they reached the far side. To the eye it was so dark, there was just the faintest outline of the mountain in the very first light of the day. You couldn't even see the trees to the right and I was really suprised to see a reflection!