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Lensing


Fixed Focal   Zoom / Vari Focal   Telecentric   Microscope                                                                                              .................................................................................................................

The correct lens is essential to detecting and \ or measuring small features.  The lens must be matched to the imaging sensor to ensure both can resolve the features you need to detect.  Then the lens must be match to the applications field of view, resolution, working distance and depth of field.  Additional factors that will determine image quality include distortion depth, telecentricity, vignetting and contrast.


                      

Fixed Focal Length


Specifications

Fixed focal length lenses are defined by a single angular field of view or focal length.  They typically have a minimum working distance with no maximum.  Objects closer to the lens will appear larger than objects farther from the lens.  Light weight, low-profile designs.





Telecentric



Specifications

With a conventional lens, an object that is closer to the lens (shorter working distance) will appear larger than an object farther from the lens )longer working distance).  Telecentric lenses are lenses without this perspective or parallax error.  The lack of perspective error makes telecentric lenses ideal for metrology and gauging applications.  Telecentric lenses pftern offer superior image quality and are offered in magnifications ranging from 0.08x to 6x.




 


                     

Zoom / Vari Focal


Specifications

Zoom lenses and vari-focal lenses both offer the flexibility of changing the focal length, or angular field of view, of the lens.  Zoom lenses will maintain focus as the focal length is modified (parfocal) while Vari-Focal lenses require refocusing.  Changing the focal length of the lens allows different fields of view to be imaged with minimal changes to the overall system.  Zoom lenses are ideal for applications where the entire object as well as small features with the object need to be inspected with the same imaging system.


Microscope



Specifications

Microscope style lenses are typically high magnification lens assemblies that are highly toleranced offering superior image quality.  These lenses are available in a variety of working distances making them ideal for a wide range of applications.  Lenses are available with in-line illuminatioin or filters.








       

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