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At the top of the electron microscope is the electron gun. As we've discussed it has a filament and then what's often called the Wehnelt cylinder. And then an accelerator stack to accelerate the electrons as they come out and head down the column. And this is called the electron gun. Next we have the first lens system, which is called the condenser lens system. Complete with a set of deflectors and lenses, usually there's two called C1 and C2, stigmators and an aperture. The purpose of the condenser lens is to take the electrons coming out of the gun and focus and direct them onto the sample.