Olympus U-TR30-2 Gebruiksaanwijzing - Pagina 26
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Significance of Objective Name
(Examples)
Glossary of Terms Used in the Optical Characteristics Table
Working distance (WD)
Number of aperture (NA) : Important figure determining the objective characteristics (resolution, focal depth and bright-
Resolution
Depth of focus
Field number
Field of view
22
M
PL
(Plan)
PL : Plan, or correction of image curving on peripheral area.
M
: Metal observation (no cover)
LM : Long-WD metal observation
SLM : Superlong-WD metal observation
LC : Observation over glass plate
: The distance from the top of specimen and the front lens of objective.
ness).
Resolution ............. Increases in proportion with the NA.
Focal depth ......... Decreases in proportion with the NA.
Brightness ............. Proportional with the square of NA (comparison under the same magnification).
: The limit that an objective can identify the images of two points that are close to each other,
expressed as the distance between the two points on the specimen.
: The maximum depth of the specimen at which the entire specimen can be brought into focus
simultaneously. This value increases when the aperture iris diaphragm is narrowed and de-
creases when the objective NA is increased.
: The diameter of the image area that can be observed through the eyepieces, expressed in mm.
: The diameter of the area observable on the specimen, expressed in mm.
FL
N
None : UIS
N
None : Achromat, or aberration correction with 2 wavelengths (red and bleu).
FL
: Semi-Apochromat, or color aberration correction with visual wave-
lengths (bluish purple to red).
APO : Apochromat, or color aberration correction with all visual-domain
wavelength (purple to red).
100
BD
None : Brightfield
BD
BDP : Brightfield/darkfield or
IR
Figure : Magnification
: UIS 2
: Brightfield/darkfield
polarized
: IR light