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Sensors and Lenses

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Sensors and Lenses

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It can be tempting to image at what is called the Nyquist frequency, which is defined in Equation 1 from Advanced Lens Selection. However, this is generally not a good idea, as it implies that the feature that is being observed falls on exactly one pixel. Were the imaging system to shift by half a pixel, the object of interest would fall between two pixels and would blur out completely. For this reason, imaging at the Nyquist frequency is not recommended. Assuming no sub-pixel interpolation is being used, imaging at half of the Nyquist frequency is generally recommended, as this will allow the feature of interest to always take up at least two pixels.

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