![]() ![]() Note that the "effective" aperture diameter is the frontal dimension “D” in the diagram above, called “entrance pupil” ( Wikipedia). The nomenclature is f/ denoting focal length and the division. The f/stop numbers are fractions of the focal length. The number for lens f/stop in photography (for example, f/8) is the ratio of lens focal length divided by the effective lens aperture. The choice and balance of these three factors is all important to photography.Ĭamera design involves math and physics, but still the very useful purpose of the f/stop numbering system is the grand concept that the same f/stop, like say f/8, will be the same exposure in any lens or camera, regardless of focal length, or physical lens size or construction. ![]() A higher ISO is more sensitive to light, helpful in dim light or at extremes of shutter speed or f/stop, but which after a point, adds greater digital noise. ISO is the sensitivity to light, how well the light registers on the sensor.A faster shutter stops motion better, but which reduces the exposure, which can be compensated by opening aperture or increasing ISO. Shutter speed is the time duration while the shutter is open, letting light in.However a larger f/stop Number creates more depth of field and, up to a point, can be generally sharper. The smaller the f/stop Number, the larger the aperture diameter, passing more light. The f/stop Number is about the diameter of the lens aperture, which is how much light it lets in.Then the third page shows charts of the actual precise goal values of the settings the camera actually uses. The Camera Numbers: This page is about "What are those numbers?" There is a How Many Stops? Calculator on the Next following page to help with the numbers. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |