Previously, cameras by gay wedding photographers nyc were mechanical, they were able to increase / decrease the exposure parameter by one step in one step (that is, a change in shutter speed by a factor of two or an aperture by 1.4 times – any change corresponds to a change in the amount of light by a factor of two), then there was no greater accuracy required. The standard step “by steps” (in English “stop”) for shutter speed, downward, is: 1, 1/2, 1/4, 1/8, 1/15, 1/30, 1/60, 1 / 125, 1/250, 1/500, 1/1000, 1/2000, 1/4000 and 1/8000 (all these are fractions of a second, of which only the denominator is usually written); and for aperture it is: 1, 1.4, 2, 2.8, 4, 5.6, 8, 11, 16, 22, 32 (these are also denominators, so f/1.4 is larger than f/5.6). Exactly the same change was therefore invented for the sensitivity of the matrix: ISO 100, 200, 400, 800, 1600, 3200, 6400, 12800, 25600, etc. However, with the advent of electronically controlled cameras (late film models and all digital ones), there was also a need for more accurate exposure, which was already allowed by the exposure meter modules installed in them, and therefore, it was customary to divide each stage into three parts, as a result of which shutter speed, aperture and sensitivity values can now be set more accurately. Today, in some cameras, by the way, you can choose the step of changing the sensitivity in the menu: a step, half a step, or a third of a step. Aperture and shutter speed will continue to change with the parameters set by the camera itself.