How I rush to get this shot... I was at an other lake to shoot the sunrise, and at the end a big cloud was covering the Matterhorn. So decided to join a friend not so far from me. He was at the Grindjesee at 20min by foot from my spot. During the walk, the clouds gone, and I saw the potential of this blue hours. So I ran to the lake and found pretty quikly a composition. The reflection was perfect. No wind at all. With the good tilt you can get the stone under water and reflection of the sky.
18mm · f/11 · 10s · ISO 64