You should be able to work down to about 0.0000000001 (not sure what name that number has). I just tried sizing a box down to this size and it was usable.
Zooming in the orth window using the mouse didn't work though (not sure why, perhaps the zoom steps are too big?). Zooming in 3D did.
Pressing F to fit (and centre) the selction worked OK though. This is probably the key to your success - if what you are looking at is at the centre, you should be able to zoom in very close.
Andy
PS also tried sizing to 10000000000000000000000 and that was fine although lighting drops off in the orth windows. It will probably go further too.
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