Aperture Demonstration for better Autofocus performance.
Автор: Nevin Williams
Загружено: 2016-03-16
Просмотров: 73
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I wanted to do a demo of how aperture (ƒ/stop value) affects focus and depth of field.
Increasing the depth of field makes more objects, both near and far, remain in focus without the camera hunting. This is commonly accomplished by decreasing the camera's aperture: the iris that controls how much light reaches the sensor.
The numerically higher the ƒ/stop value, the smaller the iris.
The downside of a higher ƒ/stop value is to achieve the same exposure level of a scene, brighter lighting, a higher ISO, and/or slower shutter settings need be used. However, just a small increase in ƒ/stop can have a big impact on field depth, without affecting exposure levels too much.
For a subject, I wanted something with clear, uniform writing, on a background that depicted scale reasonably well. And then this happened...
The stills were taken with my Nikon D3200, with a focal length of 18 mm, focused on the middle bottle with the green cap.
Aperture values started at ƒ/3.5, and proceeded through 4.5, 5.6, 7.1 and 9.
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