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Abbreviations used for objective
Glossary in optical performance table
Working distance: Distance between the tip of the objective and the focal position
Numerical aperture: Important value that determines the performances (resolution, focal depth and brightness) of the
objective
Resolution
Increases in proportion to the numerical aperture.
Focal depth Decreases in proportion to the numerical aperture.
Brightness
Increases in proportion to the square of the numerical aperture. (comparing with the
same magnification)
Resolution:
Indicates the limit where the objective can identify two approaching images using the distance between
2 points on the sample surface.
Focal depth: Indicates the sample depth focused at the same time. The depth increases when the aperture
diaphragm is narrowed down and decreases when the numerical aperture of the objective becomes
larger.
Field number: Indicates the diameter of the image area visible by the eyepiece in mm.
Actual field:
Indicates the diameter of the field area on the sample surface in mm.
Ex)
None UIS objective
N
UIS2 objective
None Achromat: Corrects the aberration by 2 wavelengths (blue and red).
FL
Semi-apochromat: Corrects the color aberration in the visible range (from blue-violet to red)
APO Apochromat: Corrects the color aberration in the entire visible range (from violet to red)
M
For metal (without cover)
LM For long working distance metal
SLM For super long working distance metal
LC For observation through glass
PL Plan: Corrects the image plane curvature around the field.
Number Objective magnification
None For brightfield
BD For brightfield/darkfield
BDP For brightfield/darkfield, polarization
IR
For infrared
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