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Nikon 18-200mm. (enlarge)
Lateral Chromatic Aberration (LCA) (What is LCA?)
LCA is called "purple fringing" by hobbyists.
The Nikon 18-200mm is free from visible LCA except at the very ends of the zoom range.
You can fix it with PhotoShop CS2's Lens Correction Filter.
18 mm: Moderate. Try a setting of +10 to +14 under "Red/Cyan" in CS2's Lens Correction Filter. Also try +5 for Red/Cyan and -6 for Blue/Yellow or just -12 for Blue/Yellow. See what works for you.
24 mm: Minimal. Leave it alone, or set Blue/Yellow to -5.
35 mm: None.
50 mm: None.
70 mm: None.
105 mm: None.
135 mm: None.
200 mm: Negligible secondary (green/magenta). Leave it alone or try +7 under Blue/Yellow.