Lago di Carezza, the rainbow lake.

Lago di Carezza is small – barely 300 m long and 140 m wide – but it punches far above its size. Underground springs feed it straight from the Latemar, and on the right morning the whole range mirrors in the surface so cleanly it looks fake. The Ladin name, Lec de Ergobando, means "lake of rainbows," and the emerald-to-turquoise shift in the water is real, not a preset invention.

Here's the thing nobody tells you: of all the famous Dolomites lakes, this is the one where conditions matter most. The mirror effect needs two things at once – calm air and direct sun on the Latemar. Get a breeze and the reflection breaks up; get cloud and the emerald color falls flat. The lake sits in a small wind-sheltered depression, so even a light breeze is usually survivable, but the margin is thin. The shot is the reflection, so plan around the reflection.

Shoot at sunrise on a clear, calm morning. That's when the Latemar catches alpenglow, the water is at its stillest, and the tour buses haven't arrived from Bolzano yet. By mid-morning the main viewing platform is shoulder-to-shoulder and the light goes flat. There's a fence around the entire lake – it's a protected natural monument, no swimming, no climbing down to the shore – so every angle is shot from the elevated loop trail. That's a constraint, not a problem: the elevated path is exactly where the reflection lines up.

One technical note that matters here more than most places: if you reach for a circular polarizer, go easy. Crank it all the way and it kills the very reflection you came for. Dial it back until the Latemar comes back into the water, using it only to cut glare off the trees and rocks. On focal length, 28mm covers the full lake-and-peaks frame comfortably; go wider for more foreground, or longer to compress the Latemar so it looms larger behind the water. Both work.