Based on their applications, special-purpose microscope objectives mainly fall into the following categories:
1) Phase contrast objective is a specialized lens for phase contrast microscopes (although it can also be used routinely).
The characteristic is that a phase plate is installed at the back focal plane of the objective lens to delay the light wave.
2) A correction collar objective is equipped with a ring-shaped adjustment ring in the objective lens. When the adjustment ring is rotated, it can be adjusted
The distance between the lens groups inside the objective lens (usually the second and third lens groups) is used to correct the coverage caused by non-standard cover glass thickness
Poor.
3) The iris diaphragm objective is equipped with an iris diaphragm at the upper part of the objective lens barrel, and also has a rotatable outer side
The adjustment ring can adjust the size of the aperture when rotating. This structure is the most advanced oil immersed objective lens.
4) Strain free objective is a type of objective lens that overcomes the presence of stress in the assembly of lens groups and is specifically designed for transmission
The objective lens used for polarizer inspection can achieve better polarizer inspection effect.
5) Non fluorescent objective is an objective lens specifically designed for use in epifluorescence microscopes. This type of objective lens, even if subjected to
It does not emit fluorescence even when strongly excited by a light source.
6) No cover objective: Some objects, especially smear slides, cannot be covered with a cover glass
During microscopic examination, an uncovered objective lens should be used, otherwise the image quality will significantly decrease, especially during high magnification examination.
