2. FOCUS, RESOLUTION, AND SHARPNESS
WHAT IS FOCUS? In the world of photography, focus refers to light rays passing through a lens and converging on the imaging device. This is generally accomplished by a lens element, a group of lenses, or the entire lens moving so that an image can be formed on the imaging sensor.
When a lens is focused properly, a single point from the field of view is rendered as a single point on the image sensor. In general, the higher the quality of the lens, the finer the point of focus that can be rendered. A high-resolution sensor should be matched with a high-resolution lens.
Resolution
Inadequate lenses were a notable ...
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