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The biggest restriction (if you want to call it that) with your lenses is that they will look longer on your D90. The 28-80 will be more like a short telephoto zoom (42-120 in the 35mm terms you're used to) on the D90. You might want to consider a DX format 'standard' zoom, like the 18-55 (which on the D90 is pretty much what you're used to with the 28-80 on the F100) or the 18-105. The 70-300 will work fine, and because the D90's sensor is a bit smaller than 35mm film it will bring your subjects closer. Similarly, the Sigma 105 Macro will fill the frame with the same subject at a bit greater distance, or with a smaller subject at the same distance.
The SB-28 won't give you TTL flash on any Digital Nikon. Because digital sensors are a lot different from film in the way they reflect light, there's a different system of TTL flash for Digital than there was for the film cameras. You can use your flash in manual and (if it has it) A or AA mode.
Hope this helps
Chris
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