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

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

        return $this->data[self::FOCAL_DISTANCE];
    }
public function getFocusDistance ( ) { if ( ! isset ( $ this -> data [ self :: FOCAL_DISTANCE ] ) ) { return false ; } return $ this -> data [ self :: FOCAL_DISTANCE ] ; }
Returns the focus distance, if it exists

@return string|boolean
Returns the focus distance if it exists