Canon PowerShot SX70 HS Digital Camera - Manual (Page 114)

Using Digital Tele-Converter
The focal length of the lens can be increased by approximately 1.6x or 2.0x.
This can reduce camera shake because the shutter speed is faster than it
would be if you zoomed (including using digital zoom) in to the same zoom
factor.
1
[Digital zoom] → [1.6x] or [2.0x]
z The view is enlarged and the zoom factor
is displayed.
114