In article <19970203053000.AAA11804@ladder01.news.aol.com>, seadog6224@aol.com says...

>I am starting macro photography using the following equipment.
>Nikon F4
>N90
>200mm f4 Micro Nikkor
>90mm f2.8 Micro
>60 mm f2.8 Micro
>By adding extention tubes or the Nikon close up filters would i get the
>sharpest image?

Nice gear for Macro (but that "90" is probably a 105, if Nikkor...;-).
If using smaller stops, tubes, achromats, and teleconverters can all
be fine, and may even work well in combinations for even greater
magnifications... Testing is about the only way to be sure what works
best, and what doesn't work well for what you want to do.
Hope This Helps