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What these guys stated is spot on, but let me add my 2 cents.
With the 18-70 f/3.5-4.5 lens, when you have the lens set at 18mm, your max (or widest) aperature will be 3.5. Not the fastest, but not too bad. When the lens is zoomed out fully to 70mm, the max aperature will only be 4.5. Sorry, not very fast at all.
It's the same with the 55-200mm lens. Your max aperature when zoomed to 200mm is only 5.6.
This is not to say that the lens quality and edge to edge sharpness won't be good, but be prepared to shoot at faster speed films, or faster ISO's if digital. Things will just be a bit grainier (or noisier). Probably won't be the least bit of a problem, unless you're trying to make a living with photography.
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