Is WiFi on the F800EXR of any use?

Why is it useles for laptops?

It works fine on my laptop, which also has a card reader.

The technology allows you to quickly check images to make sure they are focused and not over-exposed or clipping or crushing highlight colour.

For toy cameras like the F series it allows you to quickly upload an image to your web space, whether that be Facebook or one of the other social media sites which are catering to smart phone users.

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Cheers
Trevor G
Silkypix tutorials at: http://photo.computerwyse.com