In actual practice, if WSI systems have quality optics with sufficient numerical aperture (as found in most current devices), and if precise focus is achieved (vide supra), then the quality of the captured image will be determined by the quality of the image sampling.
Most current systems use this method.
Recently, Leonard et al. proposed an approach using ion-implantation to define the current aperture.
This n-CBL layer can be used as a current aperture layer, which regulates the current flow via different resistivities among different current paths [31, 32].
In 2014, a GaN-based MC emitter featuring a Si-diffusion-defined current aperture developed by Yeh et al. shows a good current confinement capability [18].
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Most current drives have this capability.
Most current treadmill models have incline settings.
However, we have not observed variation in τD with aperture diameter for planar membranes above current apertures varying from 60 to 250 nm diameter.
That's the lens on the left, where the focus ring will be; the cutaway right at right is either aperture or zoom, most likely aperture since it looks notched.
