- Lenses are optics in the column that condense, expand, accelerate, or decelerate the beam - They generally are not controlled in x and y, but may be intermixed with it - They are frequently varied with scan input though - The are also varied with high voltage paramaters - Frequently they are driving - Sometime they are driven though... - In which cases it could be say that if they are driven by source stability, they the are really driving something else ### Lens functions [[Condenser Lens]] [[Objective Lens]] [[Projector Lens]] ### Electronics - [[Lens Drivers]]