Thought I would share a bit of how to expose correctly in snow. This image taken a few days ago during the Winter Yellowstone Workshop. The next session starts tomorrow, wink.
Spot meter the snow highlight adding plus 2 to 2.7EV depending on scene contrast. Sunny days plus 2, heavy overcast 2.7. Push the highlights just shy of RGB clipping, as this will move the whole image histogram to the right, making the blacks in effect brighter, not darker. Thereafter, select only the highlights and use post-production techniques to render all the highlight detail you desire. Shooting in this manner noise is almost never an issue. Note… some Nikon bodies require less of an exposure increase, typically .7 stops less than above. Best to test your gear, once you get the exposure nailed down it is repeatable. Manual focus in falling snow is highly recommended.
1Ds III, 70-200 II, manual focus
Manual, Spot metered on snow +2.3 EV, 1/250 @ f/8, ISO 400
Post-production- 15in MBP, LR3, CS5, NIK
See you where there is light, or at the computer,
Chas in YNP