4  Optics and lens systems

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4.1 Geometric optics

4.1.1 The pinhole model

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4.1.2 Thin- and thick-lens models

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4.1.3 Focal length, f-number, aperture

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4.1.4 Field of view and working distance

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4.1.5 Depth of field and hyperfocal distance

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4.2 Real lens behaviour

4.2.1 Spherical and chromatic aberration

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4.2.2 Geometric distortion: radial and tangential

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4.2.3 Vignetting and cos⁴ fall-off

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4.2.4 Modulation transfer function and resolving power

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4.2.5 Diffraction limit

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4.3 Specialty optics

4.3.1 Telecentric lenses for metrology

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4.3.2 Macro and micro imaging

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4.3.3 Line-scan and Scheimpflug configurations

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4.3.4 Liquid and variable-focus lenses

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4.4 Optical filters

4.4.1 Bandpass, longpass and shortpass filters

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4.4.2 Polarising filters in imaging

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4.4.3 Neutral density, UV cut and IR cut filters

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4.4.4 Interference filters and dichroic elements

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4.4.5 Filter placement and stacking

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4.5 Selecting an optical configuration

4.5.1 Matching focal length to sensor size, FOV and working distance

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4.5.2 Resolution and DOF budgeting from the feature specification

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4.5.3 When telecentricity, filtering or specialty optics are required

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4.5.4 Mount standards and mechanical envelope: C, CS, F, M42, S-mount

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4.5.5 A lens-selection workflow, cross-referenced to Chapters 2 and 5

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