| Fixed-Focal-Length Lens | Stable inspection stations, presence detection, barcode reading, and general part inspection. | Commonly 8–50 mm; longer focal lengths are available for narrow fields of view. | Few mechanical components, secure locking rings, stable focus, and resistance to vibration. | Usually limited to lens-surface cleaning, focus verification, and checking mounting torque. | Good repeatability when working distance and lighting remain constant; distortion depends on optical design. | Low; focus and iris may be manually adjustable. | Suitable for protected factory environments; sealed versions are preferred where dust or washdown is present. | Low | Low | Best default choice when the camera position, field of view, and lighting are fixed. |
| Motorized Zoom Lens | Multi-format production lines, remote setup, variable product sizes, and applications requiring recipe changes. | Typically covers a variable range such as 6–50 mm or 12–120 mm, depending on the design. | Gear wear, motor reliability, cable integrity, backlash, repeatable positioning, and protection from vibration. | Periodic verification of zoom and focus positions, cable inspection, and recalibration after mechanical service. | Flexible field of view; optical resolution and distortion can change across the zoom range. | High; motorized zoom and often motorized focus or iris. | Use protective housings in dusty, wet, high-vibration, or washdown areas. | Medium to High | Medium to High | Select only when remote adjustment or multiple fields of view reduces changeover time enough to justify added complexity. |
| Telecentric Lens | Dimensional measurement, gauging, edge inspection, and applications where object-size accuracy is critical. | Often selected by object field of view rather than focal length; working distances are generally longer. | Rigid mounting, optical alignment, aperture stability, and protection from shocks that may affect calibration. | Regular lens cleaning, mechanical alignment checks, and calibration verification against a reference artifact. | Very low perspective error and low distortion; requires careful matching of sensor size, field of view, and working distance. | Low; generally uses fixed optical elements with manual adjustment. | Best in controlled environments; protective windows must be optically suitable and kept clean. | High | Medium to High | Use when measurement accuracy and repeatability are more important than the lowest initial purchase price. |
| Macro Lens | Small components, electronics inspection, surface defects, characters, and close-up detail capture. | Commonly 25–100 mm, with magnification and working distance being key selection variables. | Focus stability, depth-of-field limitations, rigid mounting, and protection against vibration. | Frequent focus verification may be required when product height, fixture position, or camera alignment changes. | High detail resolution at close range; depth of field can be limited, especially at high magnification. | Low to Medium, depending on focus and iris configuration. | Suitable for clean or moderately protected areas; use a cover where particles can settle on the front element. | Medium | Medium | Choose based on required magnification, depth of field, working distance, and sensor compatibility. |
| Liquid Lens | Fast autofocus, variable object distance, high-speed identification, and systems with frequent product changes. | Variable electronically controlled focal range; exact range depends on the optical module and sensor format. | Electronic driver stability, control integration, thermal conditions, sealing, and protection from electrical transients. | Low routine mechanical maintenance; software, connectors, and focus-position verification require attention. | Fast focus adjustment with no conventional mechanical zoom group; optical quality varies across the operating range. | Low mechanical movement; electronically controlled optical element. | Use according to the specified temperature, humidity, vibration, and ingress-protection limits. | Medium to High | Medium | Consider when rapid focus changes reduce cycle time or eliminate mechanical focusing hardware. |
| C-Mount Board Lens | Compact cameras, embedded vision, space-constrained machines, and cost-sensitive inspection systems. | Often 2.8–16 mm for wide or standard views; longer options are also available. | Thread security, compact housing strength, heat exposure, and protection from dust or accidental contact. | Lens cleaning and occasional focus or iris locking; avoid over-tightening small adjustment components. | Adequate to good for compact sensors; edge sharpness and distortion must be checked for wide-angle designs. | Low; normally manual focus and iris. | Requires enclosure protection in harsh industrial environments. | Low | Low | Select only after confirming sensor format, image circle, resolution, distortion, and mechanical clearance. |
