Hello all! I am really rconfused about the optical part of a scanner head. I read that it consists of mirrors, a lens and the ccd array. But how this lens looks like? Is it like a large slice? Do really exist such lenses? How can such a lens have so good resolution and so large field of view (that the scanner needs to move only to one direction!) Any information about the scanner's optics will be appreciated :-) because until now I have found almost nothing... THX!