Canon A1200 - Manual (Page 55)

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You can use the digital zoom to zoom up to approximately 16x maximum, and
capture subjects that are too far away for the optical zoom to enlarge.
However, depending on the recording pixel setting
(p. 61) and zoom factor,
the images may appear coarse (the zoom factor will appear in blue).
Move the zoom lever toward i.
z Hold the lever until zooming stops.
X Zooming stops at the largest possible
zoom factor without image deterioration.
The zoom factor will appear on the screen
when you release the zoom lever.
Move it toward i again.
X The digital zoom will zoom in even further
on the subject.
Zooming in More Closely on Subjects
(Digital Zoom)
Zoom Factor
Turning off the digital zoom
To turn off the digital zoom, press the n button to choose [Digital Zoom] from
the 4 tab, then choose [Off].
The focal length when using the optical zoom and digital zoom together is
approximately 28 – 448 mm, and 28 – 112 mm when using the optical
zoom alone (all focal lengths are 35mm film equivalent).