thank you azy!!!! yes... these should be helpful here :] edit: fyi (from the resource center) f-stop: Used to define the aperture settings on a lens (the opening within the lens that allows light through). F-stop numbers are arranged in a series of stops (a doubling or halving of any value) numbering 1, 1.4, 2, 2.8, 4, 5.6, 8, 11, 16, 22, 32. Some lenses may have more, some less - but each numerical value is a stop, that is, it either doubles or halves the amount of light allowed to pass through the lens. (Note: the larger the number, the smaller the opening, therefor less light.) Larger numbers (less light) increases depth of field. The actual numerical values are a ratio of physical aperture opening to focal length of the lens (i.e., f4 on a 50mm lens would be a physical opening of roughly 12.5mm in diameter - 50/4=12.5).

Message edited on: 04/26/2005 13:59