I was thinking of buying macro filters for my D70s' 18-70mm lens. First, for my AE1 (i.e. 50mm lens) I know that a +1, +2 and +4 would be good enough for what I want. But would it be enough for the 18-70mm lens on the D70? I was wondering if I should consider getting the +10. Which would drive up the amount to spend and I would rather not spend it unless I had to. How much of a difference there will be between these two lenses using those filters?