Maui,
I've got a 55 mm macro which is usually use with a 2x teleconverter which ammounts to the same thing.
One of my greater dissapointments was when a Olympus 80 mm macro with matching auto, adustable extension tube (sorta tough field bellows) got some fungus or something growing on inside elements eating the multicoating. Looks like nearly invisible rootlets. Parts no longer available, so nobody will work on it and remaining examples cost 7-8 times the bargain price I bought it for new.
With Nikon you'll probably not have availabilty problems. So sad that stuff for my trusty tank-like Olympus OM-1 is now hard to find.
Don't keep your lenses in the cases, seal them in tupperware with dessicant. The dammage occurred when I lived in humid Georgia.
Another book:
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"Field Photography, Beginning and Advanced Techniques"
Alfred A. Blaker
W.H. Freeman and Company, San Francisco
1976
ISBN 0-7167-0518-4
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All kinds of do-it-yourself tricks and gizmos that will make macro (and telephoto) easier. Easy to understand calculations and a handy booklet of tables. Adequate light is key for macro, especially since you want to use the finest grain film (slowest)for resolution and smallest F-stop possible (for depth of field). This one emphasizes lightweight, portable stuff and making best use of what you've got.
Both of these books tell you how to do it without buying lots of expensive stuff. Like how to couple a pair of lenses to get really high magnifications. I particularly recommend this one if you like building stuff.