Without the filter, shooting is constrained to f/2.8 or so in sunlight, even at ISO 100 and 1/8000 second. With snow or bright sand, it might be f/4 or even f/5.6. So you might also want a 3 stop and 6-stop filter as well.
I took a few moments for some harsh daylight shooting wide open at f/1.2, made possible (just barely) by the 2 stops of density: 1/8000 second at ISO 100 at f/1.2. The nice thing about shooting wide open in sunlight is that the lower contrast of a wide open f/1.2 lens helps offset the harsh mid-day lighting. I’m not so delighted with Canon 5D Mark II image quality under such conditions, but perhaps Canon will deliver a better sensor this year.
I really like this new piece! — Martin D
That was worth the years subscription in one article! — Timothy A
Watch your gamut with bright colors: I converted the image below to sRGB for web display, and so it’s a little dull. But with a wide gamut monitor, such distinctions are obvious.