Achrovid Infinity Corrected Microscope Objectives
Although video inspection microscopes play an essential role in high magnification
process monitoring and machine vision, they have invariably been equipped with objectives
primarily designed for visual purposes. In video terms, such objectives have stated
numerical aperture (N.A.) ratings that are more theoretical than practical.
This is because "visual-dedicated" objectives "presume" that
an end-user will constantly monitor each image to obtain a proper balance between
contrast and resolution—through either an adjustment of condensing optics, a variation
in aperture—or both. Unfortunately, it is impractical to monitor each image and
adjust this balance on an individual basis in automated video applications or where
many objects are being constantly examined. Moreover, the cross-over point between
resolution and contrast occurs at less than full aperture (full N.A.).
The Achrovid Series
Achrovid 10x (0.21 NA)
Nelsonian Objective
Which presently consists of six infinity-corrected microscope objectives ranging
from 2x (0.054 NA), 2.5x (0.064 NA), 3.3x (0.077 NA), 4x (0.09 NA), 5x (0.12 NA)
to 10x (0.21 NA)—were developed to overcome these limitations. To do so, the Achrovid
objectives were designed upon criteria originally developed by E.M. Nelson. This
assures the best possible maximization of contrast and resolution for video applications.
As a result, Infinity-Photo-Optical Company has developed the first range of specifically
"video-dedicated" microscope objectives. Even though their stated N.A.
ratings are somewhat lower than traditional "visually-dedicated" objectives,
the Achrovids achieve what is considered to be a more usable and pleasing image
without complication or any need to individually monitor each successive image for
best results.
All Achrovid objectives are mounted via the common "M"-thread (26mm/Whitworth)
and are therefore compatible with all "M"-thread instruments. They were
specifically designed for all Infinity products that accept external microscope
objectives (InfiniTube™,
Model KC VideoMax™,
Model K2 DistaMax™, and Model K1 CentriMax™).
All have 37mm working distances except the 10x which has a working distance of 17.3mm.
The Achrovid Series represents a breakthrough in consistent, trouble-free use coupled
with high performance image quality. In addition, they are priced below most—if
not all of their "visual-dedicated" counterparts.