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.  An
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