Achrovid¢â
Video Microscope Objectives
(.pdf
)
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 "visually-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.).
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The Achrovid
Series - which presently consists of six objectives
ranging from 2x, 2.5x, 3.3x, 4x, 5x to l0x?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¢â, InfiniTube-EX¢â,
Model KC¢â and InFocus¢â) by means of an M26 to M27 Adapter. All have
37mm working distances?except the l0x which has a working distance
of 12.5mm. A forthcoming Parfocal Adjuster Tube will allow the l0x
Achrovid to equalize itself for parfocality when used with other
Achrovids on a revolving turret nosepiece.
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.
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