public function getIso()
    {
        if (!isset($this->data[self::ISO])) {
            return false;
        }

        return $this->data[self::ISO];
    }
public function getIso()
    {
        if (!isset($this->data[self::ISO])) {
            return false;
        }

        return $this->data[self::ISO];
    }
public function getIso ( ) { if ( ! isset ( $ this -> data [ self :: ISO ] ) ) { return false ; } return $ this -> data [ self :: ISO ] ; }
Returns the ISO speed

@return int|boolean
Returns the ISO speed