On top of the vegetables list are cucumber and lettuce, consisting of 96 percent water. Zucchini, radish and celery are comprised of 95 percent water. Ninety-four percent of tomato's weight is water, and green cabbage is 93 percent water.
I looked at the process sigma calculator (button in upper right below the search box) and they present a link to a forum post (http://www.isixsigma.com/forum/showmessage.asp?messageID=437) that gives information on calculating the sigma using a normsinv function.
Sigma produces lenses with exclusive fixed mount systems; therefore it is not possible to change the mount of your previous mount system lenses. If you compare the angle of view of the 14mm f/3.5 ultra wide-angle and 15mm f2.8 fish-eye lenses, which lens has wider angle of view.