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Pana TZ30 /SZ20: why the video focal lenght is different?

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Leonardo Ita

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from panasonic specs:

LUMIX® DMC-ZS20 14.1 Megapixel Digital Camera

Focal Length f=4.3 - 86.0mm (24 - 480mm in 35mm equiv.) / (28-560mm in 35mm equiv. in video recording)

maybe they use a crop of sensor ?
 
this is often done to minimize barrel distortion - what is auto corrected in photo mode but needs much more processor power than available to have it in video mode
 
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