Most of my exposures are long, but that has a lot to do with the lack of light under the old redwoods than format. And then there is this thing about having everything in focus, so I am using f32 to f64, sometimes f90 -- there are few distance views in the redwoods, so one is dealing with distances of 6 to 8 feet away in the foreground, and the background being 30 feet to several hundred yards away. I am using an 8x10 with a standard lens of 300mm -- so due to the long focal length, the inherently small DoF is something to contend with. It is a relatively fast lens -- f5.6, but I rarely use anything less than f22. Portraiture is where one often see lenses used wide open
So my exposures (125 ASA to 400 ASA films) range more in the minute range, as in one to 30 minutes. The trick is knowing when the wind is not blowing in a particular area. After 30 years of photographing along the same creek, I can step outside and have a good sense of what the weather/wind will be doing up there (it is 50 miles north of my home). If the wind (or just the lightest of a breeze) is blowing when I get there, it just turns into a nice day for a walk -- and I might as well take the 8x10 along just in case the wind stops, or I come across an image that I can put the word "Wind" into the title.
