Some lenses include eccentric rings, or elements in adjustable via a three point fixture, or similar collimation adjustment facilities.
Do these correct for inaccuracies in the way the glass is manufactured (eg the lenses themselves having eccentric rims), or for inaccuracies in all the concentric metalwork? When working on such a lens (without having collimation equipment available), is it advisable to reinsert glass elements in the same rotational orientation, or should one mainly focus on disturbing eccentric metalwork as little as possible?
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