It's summer and I have practically nothing to doMy best friend lives 3 hours awayAny suggestions? Thanks!!!!!!!!!!!!
how wide the lens is openlook at the little numbers on the dial at the end of the lens
How wide open the lens is (aperture) The higher the f-stop, the SMALLER the lens opening, aka the less light comes in through the lens The lower the f-stop, the BIGGER the lens opening, which lets a lot more light in Thus, an f-stop of F8 is a lot wider (lens is open more) than an f-stop of F22F8 will let in a lot more light then F22 The depth-of-field is directly related to the f-stopThe higher the f-stop (aka the smaller the lens opening), the deeper the depth-of-focus isSo, an aperture of F8 will have a much narrower DOF (meaning less of the photo will be in focus) than will an aperture of F22 (where most of the picture will be in focus).
The f/stop is the diameter of the aperture opening in the lens Numerically, it is the ratio of the focal length of the lens to the physical diameter of the openingThus, as the opening becomes physically smaller, the f/stop number becomes largerThe aperture determines two things If everything else is constant, 1A larger diameter aperture (smaller f/stop setting) allows more light through the lens The issue here is that the amount of light (aka the 'exposure' required to record the image is determined by the rated speed of the film (or the speed setting if you are working in digital)The other factor that determine how much light can get through the lens is the shutter speedSo a larger diameter aperture allows more light through the lens, which means that you can use a shorter shutter speed to achieve the same exposureAnd a shorter shutter speed may be necessary to deal with subject motion2A larger diameter aperture (smaller f/stop setting) results in less depth of fieldThat the front-to-back region in the image that appears in sharp focus will be narrower with a small f/stopConversely, use of a large f/stop (meaning a small aperture opening) will result in a larger front-to-back area in sharp focusDepth of field is important in that it allows you to separate a subject from foreground and background elements in an image.
