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| Eyepiece Type | Adjustable Eyepiece |
| Eyepiece Optical Magnification | 10X |
| Plan Eyepiece | Plan Eyepiece |
| Eyepiece Size for Eye Tube | Dia. 30mm |
| Eyepiece Field of View | Dia. 24mm |
| Eyepoint Type | High Eyepoint Eyepiece |
| Eyepiece Size for Reticle | Dia. 25mm |
| Eyepiece Diopter Correction | +5°~-10° |
| Eye Guard Installation | Fixed Eye Guard |
| Material | Metal |
| Color | Black |
| Net Weight | 0.17kg (0.37lbs) |
| Applied Field | For Mitutoyo MF, MF-U and FS70 Microscopes |
Technical Info
| Eyepiece is also called ocular. Eyepiece is a visual optical device that is used to observe an image formed by an objective lens after magnification. Eyepiece can magnify the real image obtained by the magnification of the objective lens to form a clear and erect virtual image at the least distance of distinct vision (LDDV). For aberration, eyepiece is usually composed of several lenses that correct the residual aberrations produced during imaging by the objective lens. Usually, eyepiece has a relatively larger field of view and angular magnification. The eyepiece is provided with a diaphragm in the middle of the upper and lower lenses, or at the lower end of the lower lens, wherein micrometer, reticle, pointer and other accessories are mounted. On the eyepiece there is engraved with the following marks: eyepiece type, magnification, field of view number, and the like. For example, eyepiece is engraved with PL10X/22; PL represents plane eyepiece, or flat-field eyepiece, 10X is the magnification, 22 represents the field of view, and the glasses mark represents high eyepoint eyepiece, and C represents compensating eyepiece. Generally, the outer diameter of the eyepiece of a compound microscope is 23.2 mm, and stereo microscope can have a much larger field of view diameter because of its low magnification, so the outer diameter is mostly 30 mm (or 30.5 mm). The resolution capability of the microscope is determined by the numerical aperture of the objective lens, while the eyepiece plays only the magnification role. Therefore, for structures and details that cannot be distinguished by the objective lens, the eyepiece still cannot distinguish even if it is magnified again. |
| The adjustable eyepiece is between the lens of the eyepiece and the focal plane, with distance adjustable device. For most people, their two eyes, the left and the right, have different vision. For adjustable eyepieces, the eyepoint height of the eyepiece can be adjusted to compensate for the difference in vision between the two eyes, making the image in the two eyes clear and consistent. The range of adjustment of the general eyepiece is that the diopter is plus or minus 5 degrees, and the maximum difference between the two eyepieces can reach 10 degrees. Before use, it is generally necessary to adjust both eyepieces to the initial position where the scale is displayed as 0, which is used as a baseline to facilitate up and down adjustment. The reticle position of the eyepiece is generally 10mm below the fixed position of the eyepiece tube. Because the vision of each person is different, some people may not be able to see the reticle clearly. For adjustable eyepiece, the height of the reticle position can be adjusted to make the reticle and the observed object clear at the same time, this is the advantage of adjustable eyepiece that mounts the diopter adjustment on the eyepiece tube compared with non-adjustable eyepiece. When non-adjustable eyepiece is equipped with a reticle, if the diopter is adjusted, the reticle will rotate accordingly, thereby affecting the position of the measurement. For adjustable eyepiece, when its diopter is adjusted, its reticle does not rotate. |
| Eyepiece optical magnification is the visual magnification of the virtual image after initial imaging through the eyepiece. When the human eye observes through the eyepiece, the ratio of the tangent of the angle of view of the image and the tangent of the angle of view of the human eye when viewing or observing the object directly at the reference viewing distance is usually calculated according to 250 mm/focal length of eyepiece. The standard configuration of a general microscope is a 10X eyepiece. Usually, the magnification of the eyepiece of compound microscope is 5X, 8X, 10X, 12.5X, 16X, 20X. As stereo microscope has a low total magnification, its eyepiece magnification generally does not use 5X, but can achieve 25X, 30X and other much bigger magnification. |
| The eyepiece field of view is the diameter of the field diaphragm of the eyepiece, or the diameter of the image plane of the field diaphragm imaged by the field diaphragm. The diameter of a large field of view can increase the viewing range, and see more detail in the field of view. However, if the field of view is too large, the spherical aberration and distortion around the eyepiece will increase, and the stray light around the field of view will affect the imaging effect. |
| Eye point refers to the axial distance between the upper end of the metal frame of the eyepiece and the exit of pupil. The exit of pupil distance of high eyepoint eyepiece is farther than that of the eye lens of the ordinary eyepiece. When this distance is greater than or equal to 18mm, it is a high eyepoint eyepiece. When observing, one does not need to be too close to the eyepiece lens, making it comfort to observe, and it can also be viewed with glasses. Generally, there is a glasses logo on the eyepiece, indicating that it is a high eyepoint eyepiece. |
| Eye guard installation refers to that the eye guard has been installed on the eyepiece in advance as a component. |
