Nortel Networks P5100 user manual Using the Zoom, Frame a Picture, Digital Zoom and Image Quality

Step 2 Frame a Picture

Using the Zoom

Use the zoom control to activate optical zoom. Rotate

the zoom control to f(h) to zoom out, increasing	Zoom out Zoom in
the area visible in the frame, or g(i) to zoom in so that
the subject fills a larger area of the frame.

When the camera is zoomed in to the maximum magnification (3.5×), rotating and holding the zoom control at g(i) triggers digital zoom. The subject is magnified up to 4×, for a total magnification of 14×.

When digital zoom is in effect, the camera will focus on the subject in the center focus area.

A monitor indicator shows the current zoom ratio.

		V
Zoom indicator is	Optical zoom	Zoom indicator turns
displayed when the		yellow when digital
zoom control is rotated		zoom is in effect

BDigital Zoom and Image Quality

If possible, digital zoom will create a picture by cropping the area visible in the monitor to the current image size (A92), increasing magnification without affecting quality.

If the crop would be smaller than the current image size, additional pixels are added through a process known as interpolation, creating a slightly “grainy” image.

The amount of zoom available before interpolation is used depends on the option currently selected for image size, as shown in the following table. The camera pauses temporarily in its zooming operation when it reaches the maximum zoom ratio possible before interpolation is used. Vis displayed when interpolation is in effect.

Maximum zoom ratio without interpolation

Basic Photography and Playback: Auto Mode

Image size	Zoom ratio
F, I, 3.5× (up to the maximum
G, H	optical zoom ratio)

E4.2× (digital zoom up to 1.2×)

D4.9× (digital zoom up to 1.4×)

C6.3× (digital zoom up to 1.8×)

Image size Zoom ratio

B8.4× (digital zoom up to 2.4×)

A10.5× (digital zoom up to 3.0×)

J13.3× (digital zoom up to 3.8×)

K14× (digital zoom up to 4×)

Digital zoom can be limited to the range at which interpolation is not in effect, or it can be turned off (A129).

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