The 2010 Canon PowerShot SX30 IS carried the longest zoom of any camera at launch - 35x, 24-840mm equivalent - on a 14MP CCD bridge body.
An f/2.7-5.8 lens with 4.5-stop stabilisation, articulated screen and the Zoom Framing Assist button (zoom out, reacquire, snap back) made the 840mm end genuinely usable handheld.
Its significance is as the best-selling family superzoom of its day and a brief world-record holder, now one of the most common bridge cameras in the UK used market.
Used buying: cycle the full 35x zoom several times - stuck-zoom lens errors are the classic fault - verify the stabiliser visibly steadies the long end, and check the NB-7L battery still holds charge.