S ome people asked me that question. I used to use mostly Fujichrome Velvia 50 asa slide film. 50 asa is not much, but when you are on snow or with a wide aperture lens, that's fine.
Colors are awesome and grain is virtually non existent.
The bluish hue on some of the pictures is due to the altitude. The Velvia, when underexposed, will give you green snow. In 2000, the new Fujichrome Provia 100 F made me change my mind. It has the same grain as the Velvia, colors almost as saturated and it gives you more flexibility in the exposure. AA batteries .