I scared the temptation to get a macro lens is just BBB..Thou I have a tendency to shoot flora. For now, Raynox 250 on my 18-55 matches quite well for flora close up (still can AF quite well). but Raynox 250 on 55-250 is much much tougher with that kind of magnification (also have to MF all the time, AF can't get a lock on).
Thanx for all the definitions and calculations (though it kinda gives me headache as i hated maths. haha.. jus kidding)
Nonetheless, Im more enlightened and know what to get for myself..