In terms of buying a macro - we'd first have to know what you want to photograph.....but I have experience with the 105 and it's great as both a portrait and a macro lens.
The 200 has a great reputation but I've not tried it (yet)but I've had my eye on this lens for a while so I do know a bit i can share.
The difference between the two will be:
- The 200mm I think only works in manual with the cheaper Nikons and with AF only with the higher end models so be careful, the 105 will work on your D40
-The 200mm will let you do macro at 1:1 FARTHER away from the subject. This makes the subject much easier to light.
-The 200mm is heavier and heftier.
-The 200mm is an F4 lens and not VR (vibration reduction) the 105 is a 2.8 (more or less and it has wobble play on the macro side) VR lens.
-Last i looked the 105mm was around 850. and the 200mm 1700. or so. The 200mm is also hard to find...
Hope that helps,
marko
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