Using The Digital Zoom/Digital Tele-Converter - Canon PowerShot SD850 IS Digital ELPH User Manual

You can shoot zoomed images using the combined digital and
optical zooms. The focal lengths (35mm film equivalent) and
characteristics are as follows.
Option Focal Length
Standard 35 - 560 mm
Off 35 - 140 mm
1.6x 56 - 224 mm
2.0x
70 - 280 mm
Characteristics
You can shoot at a maximum zoom
factor of approximately 16x using a
combination of the optical and digital
zoom features.
Shoots without using the digital zoom.
The digital zoom locks at the selected
factor and the focal length shifts to the
telephoto setting.
Compared with the [Standard] and [Off]
options at a similar angle of view, this
option uses a higher shutter speed to
reduce the potential for camera shake.
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