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light between the objective lens and tube lens,
allowing the creation of user-specific or task-
specific optical systems. To establish real flexibility
with such a system, it is necessary to eliminate the
occurrence of coma aberration.
*In UIS2/UIS objective lenses, the parfocal distance is designed
at 45mm and the focal length of the tube lens is 180mm.
Basic dimensions of UIS2/UIS optical system
The UIS2/UIS optical system optimally corrects
aberration with a dedicated telan lens and an
eyepiece so that the coma aberration and flatness
are not degraded even when the telan lens exit
pupil position is changed by changing the
objective lens and telan distance. This makes it
possible to use a distance of 50mm to 170mm
from objective lens mounting position to the single
port tube with lens.
*Coma aberration: refer to the optical terminology at the end of
this document.
What's infinity-corrected optics?
UIS2/UIS optics is an infinity-corrected optical
system — in other words, a system in which light
passes from the specimen through the objective
lens without forming an image along the way.
Instead, it travels in the form of infinity parallel rays
to the tube lens. The tube lens is where the
intermediate image is formed, whereas in finite-
corrected optics, this is done by the objective lens.
Advantages of infinity-corrected optics
This system, known as "infinity-corrected optics",
offers a number of advantages:
• There is no change in magnification even when
the distance between the objective lens and tube
lens is altered.
• With the total magnification remaining constant,
there is no image aberration — even when
prisms or sliders are interposed between the
objective lens and the tube lens.
As thousands of users have found by experience,
these advantages are crucial to composing the
ideal microscope optical system. What's more, it
is even possible to freely insert or remove
intermediate attachments in the parallel rays of
Figure 1 Infinity-corrected and
finite-corrected optical system principles
Infinity-corrected optical system
Finite-corrected optical system
Parallel light beam
Eyepiece
Eyepiece
UIS/UIS2
objective lens
Objective
lens
Tube lens Intermediate
image
Intermediate
image
3
WELCOME TO UIS2/UIS OPTICS
UIS2/UIS:
The System That Maximizes The Advantage Of Infinity-Corrected Optics
Figure 3 Basic dimensions of UIS2/UIS2
optical system
Objective lens
U-TLU
(Single port tube with lens)
Image
Recommended distance
50-170mm
* 40mm
45mm
* 84mm
57.6mm 102mm
*Basic dimensions when our revolving nosepiece and illuminator are
combined. When the position of the illuminator above is changed,
illumination performance cannot be maintained.
Figure 2 Advantages of Infinity-corrected
optical system
Infinity-corrected optical system Finite-corrected optical system
Objective
lens
Tube lens
Objective
lens