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focusing

The action of adjusting the lens so that the subject appears sharp on the film or CCD. Most cameras now have automatic focus (AF), some have manual focus override (MF) and some have a fixed focus (F) lens that ensures things from about 1.5 meters to infinity are relatively sharp. A few cameras have a power focus (PF), which is a manual method but using a motorised focusing ring. Buying advice: Autofocus is essential if you want to use the camera effortlessly, but occasionally the system is fooled, so make sure the camera has a focus lock or infinity setting or, better still, full manual control. Also check what the closest range is. Some only go down to about one meter which is useless if you want to fill the frame with a small object such as a flower or piece of jewellery.

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focusing

Adjusting a lens’ elements in relation to the film plane so as to obtain the required sharpness in the image.
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focusing

A cowl around focusing screens that shields the screen from light other than the light from the scene being photographed.
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focusing

A simple magnifying lens that enlarges the image on a focusing screen.
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focusing

An element between the mirror and pentaprism or pentamirror in a single-lens-reflex camera. The mirror reflects the image from the lens upward onto the screen. The areas of the image that are in focus are sharply defined on the screen, while the areas that are out of focus appear blurred. The photographer views the image passing through the screen in the viewfinder window. Some Nikon SLRs and D-SLRs have interchangeable focusing screens.
nikongrossary

focusing

The ring used to adjust the lens so that the subject appears sharp on the film or CCD. Most cameras now have automatic focus (AF), some have manual focus override (MF) and some have a fixed focus (F) lens that ensures things from about 1.5 meters to infinity are relatively sharp. A few cameras have a power focus (PF), which is a manual method, using a motorised focusing ring. Lenses with a ring that allows a good grip make it easier to adjust and focus manually.
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