"You need the ball lens to help with the magnification - but any mobile phone with a decent camera and a zoom function will be sufficient, " he explained.

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The 18-year-old Kakuta, who Chelsea controversially signed from Lens, struck the ball straight at Paul Robinson, who had earlier sensationally tipped Michael Ballack's spot kick on to the post.

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Balazs Dzsudzsak broke clear down the left and crossed for Lens to slide in and knock the ball home from six yards.

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