The lens in a microscope closest to the specimen. In a compound microscope there are usually 3 to 5 objective lenses mounted in the nosepiece, allowing a selection of different magnification powers.
forms the primary image of the microscope which is seen through the eyepiece. The markings on the objective lens are the magnifying power (such as 10x), followed by the NA (0.25) and the tube length. Other numbers which appear on the objective lens may refer to the manufactures catalog number of the particular item.
The objective or front lenses are the lenses located furthest from the user's face during viewing. The diameter of one of these lenses, given in millimeters, will be the second number describing a particular binocular. Hence, a 7x42 binocular has an objective lens of 42mm. The diameter of the lens determines the light gathering ability of the instrument. The larger the lens is, the greater it's light gathering capabilities. Light is essential to image detail and clarity. Therefore, the greater the light gathering capability of a unit is, the clearer and brighter its picture. This fact might lead you to assume that bigger is always better when it comes to the diameter size of the objective lenses, but in reality the size of the lens must be considered along with magnification, exit pupil and intended usage.
The larger, or front lenses. The Objective Lens Diameter is the size of the outer (front) lens in millimeters. A 7x35 binocular has a 35mm objective lens. This helps determine how much light enters the binocular, although image brightness still depends on the size of the exit pupil. Doubling the size of the Objectives quadruples the light gathering capacity of the binoculars; for example, a 7x50 binocular has twice the light gathering capability of a 7x35 binocular and four times the light gathering ability of a 7x25 binocular (all else remaining equal).
The large lens (the one farthest from your eye) at the end of the spotting scope. The larger the diameter of the objective lens the greater the light gathering capacity, and in general, the brighter and sharper appearing the image.
the lens closest to the object or specimen in a compound microscope, astronomical or terrestrial telescope.
in a compound microscope or a telescope, the lens closest to the object being viewed
The lens in a microscope closest to the specimen. In a compound microscope there are usually 3, 4 or 5 objective lenses allowing a selection of magnification levels. BACK
A lens that focuses light on the detector.
(or Object Glass) The lens in a refractor that is closest to the object under observation.
This is the larger of the two outer lenses in the binocular. This lens is what gathers all the light that you see- the bigger the lens the more light allowed in. Also, a larger objective lens generally provides better resolution and more detail than a smaller one. The sizes range from a tiny 15mm for theater glasses to 50mm and larger for low-light and spotting binoculars. Tips: The larger the lens the more light allowed in but also the heavier the item is. The amount of light is also determined by lens coatings and the overall quality of the lens.
provides the primary magnification of the microscope. These lenses must be protected from dirt and oils as they provide the magnifying and resolving power of the microscope.
The primary lens, which refracts light from an object (mask pattern) and forms an image. Generally, it consists of multiple elements in order to minimize aberrations.
In a transmission electron microscope (TEM), this is the first lens after the specimen. In a scanning electron microscope (SEM) it is the last lens before the specimen and produces the extremely fine electron spot with which the specimen is scanned. With both SEMs and TEMs, the quality of the objective lens determines the performance of the microscope.
The lower lens in a microscope that is closest to what is being looked at. She rotated the objective lens into position, just above the slide.
The main light-collecting optical element in a telescope.
The component in a lens system initially responsible for collecting light from the source or object and forming an image of it.
the lens final lens that forms the image on the wafer.
The lens closest to the object. In a stereo (low power) microscope there are objective pairs, one lens for each eyepiece lens. This gives the 3-D effect. On a high power binocular model there is still only one objective lens so no stereo vision.
The primary light gathering optic of a refraction telescope, located opposite of the eyepiece.
The large lens at the front end of a viewing system.