Motic BA210E, Instruction Manual

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INFINITY CORRECTED OPTICS
In this optical concept the light beams are parallel after leaving the objective in the direction of the
eyepieces. A second optical element, the tube lens (normally located in the eyepiece tube) is used to
converge the parallel beams, resulting in an intermediate image. The intermediate image is focussed by
the eyepieces, to provide the real image for visual observation.
The implementation of a tube lens gives the opportunity to minimize chromatic aberrations and other
“optical defects”. Further, in “Infinity Optics” the distance between the objective and tube lens is not as
strictly fixed as in the (historically older) “Finite Optics” of 160mm tube length.
This allows additional optical components to be inserted between the objective and tube head.
Fluorescence attachments, discussion bridges, eye level risers and other options can be added without
affecting the image quality.
In general “Infinity Optics” provides flexibility and the opportunity to add additional optional features.