In microscopy, the lens function determines the resolution limit of a microscope, defining the smallest detail observable in a biological sample. Imagine a theoretical point of light, infinitely small and perfectly focused.
Understanding Lens Function Diffraction Limitations
This PSF acts as a fingerprint for the lens, capturing how it handles contrast, resolution, and edge sharpness across the entire frame. The MTF curve graphically represents how well the lens reproduces contrast and resolution at varying spatial frequencies.
This is why two lenses with identical resolution specifications can produce vastly different results in real-world shooting conditions. Issues like spherical distortion, chromatic aberration, and coma are essentially deviations from the ideal lens function.
Understanding Lens Function Diffraction Limitations
When light from a complex scene passes through the lens, the optical system mathematically convolves the scene's light distribution with the lens's PSF. This mathematical relationship is fundamental to computational photography, where algorithms attempt to reverse or enhance the effects of the lens function to recover lost detail.
More About What is the lens function
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