Create a highly realistic, ultra-clear image in a 16:9 aspect ratio, showcasing an infinite, perfectly still lake with a mirror-like surface. The lake should have no ripples or disturbances, reflecting the sky above. In the background, include soft, fluffy clouds, creating a serene and tranquil atmosphere. Capture the scene as if it were taken with the Hasselblad H6D-400c, known for its 400-megapixel resolution, ensuring every detail is incredibly sharp and vivid. The image should exude a sense of calm and infinite depth, with a bright and clear overall tone, making the scene feel almost ethereal.