Canon 300 HS - Manual (Page 65)

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You can use the digital zoom to zoom up to a maximum of 15x and capture
subjects that are too far away for the optical zoom to enlarge. The images
may appear coarse, however, depending on the recording pixel setting
(p. 73)
and the zoom factor used.
Move the zoom lever toward
i.
∆ Hold the lever until zooming stops.
The zoom will stop when the largest
possible zoom factor without image
deterioration has been reached, and the
zoom factor will appear when you release
the zoom lever.
Move it toward
i again.
The digital zoom will zoom in even further
on the subject.
Zooming in More Closely on Subjects (Digital Zoom)
Zoom Factor
Images shot at zoom factors that appear in blue will be coarse.
What if the zoom factor appears in blue?
To turn off the digital zoom, press the n button, choose the 4 tab, and
choose [Digital Zoom] and the [Off] option.
The equivalent focal length when using the optical zoom is 28 – 105 mm,
and the equivalent focal length when using the digital zoom is
105 – 420 mm (35mm film equivalent).
Turning off the digital zoom