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For lens systems with circular apertures, the diffraction limited resolution can be calculated by knowing the f/# of the lens and the wavelength of light (lambda) traveling through the optical system. The diffraction limit is the maximum spatial resolution of a theoretically "perfect" lens. No further resolution will be available beyond this theoretical value.

d.l. = 1/(lambda * f/#)

Keep the units in mm and you will end up with a resolution limit result in units of line pairs per millimeter.

e.g. - f/2.4 lens, 0.00055mm (green light) -> 1(2.4 * 0.00055mm) = 757 line pairs per millimeter.

Remember that one line pair is a dark and bright line together.

JFS - Optikos Corporation.

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Related Questions

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