Column
Exposure
Light as a physical system: metering, dynamic range, colour temperature, flat light.
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The Meter Is Not Broken: Metering Snow When the Subject Lasts a Second and a Half
Reflected-light meters do exactly what ISO 2720 and ISO 12232 specify, which is why a snowfield comes back grey — and why the correction is not one number but a range that runs from about +0.3 EV to about +2.2 EV before the light has changed at all.
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No Shade on a South Face: Alpine Contrast, and the Two Colour Temperatures of a Single Slope
Computes where the sun actually stands above Courmayeur in early March, and shows why one white balance cannot serve snow lit by a 5200 K sun and snow lit by 9000 K sky in the same frame.
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When the Mountain Disappears: Flat Light in Val Veny, and the Treeline That Saves the Frame
The commonest condition in the Alps and the least written about — cloud reduces the sky to one azimuthally uniform source, the shading gradient that described the slope stops existing, and what a camera has left to hold is a tree.