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Upright compound clinical microscopes command the second greatest market share (next to stereo microscopes) and are sold by the thousands every year. The design of these microscopes has also received considerable attention from the manufacturers with respect to ergonomic factors. Included in the new list of features are one-handed stage and focus control, optimum eye-level positioning, low-profile stages, and rigid instrument body standards, all contributing to strain-free posture for operators while examining specimens.

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High power objective

Nov 21, 2018 — The relationship between wavelength and frequency is called an inverse relationship, because as the frequency increases, the wavelength ...

High power objective microscope function

Oct 13, 2011 — The depth of field of a microscope refers to the thickness of the specimen that appears in focus at one time. It is the distance between the ...

When light shines, nearly everything it shines on will reflect at least some of it back. Kids can understand that our eyes gather that light. The light travels through the clear outer layer of the eye, called the cornea, to the crystalline lens. The cornea and lens work together to focus the light onto the back of the eye, where the retina converts the light to electric signals that travel along the optic nerve to the brain. The brain then interprets the signals as an image.

When a child uses a microscope for the first time, they may ask lots of questions, which is a great quality in a scientist! One of the inevitable questions is, “How does it do that?” Here are ways to explain the functions of microscope objective lenses.

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The first time peering through a microscope is a memorable moment for many budding scientists. As kids grow, their early curiosity can ripen into a more serious interest in science. Teachers and parents can foster kids’ interest in STEAM fields by allowing them to explore the universe of microscopic life that surrounds us all.

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How do you switch objectivesin a microscope

Foldscope offers microscope kits for students that help students understand how microscopes and microscope objective lenses function while making them easy to take outside for exploration. Order microscope kits for your students today!

Aspheric optics is a lens design with an aspheric (non-spherical) front surface to better match the shape of the cornea and provide improved visual ...

New ergonomic microscope designs incorporate a two-position motorized nosepiece, which eliminates repetitive motion of rotating the nosepiece to interchange objectives. In addition, the 10x objective is often intensity equalized, so that it is not necessary for the operator to adjust the illumination intensity (lamp voltage) when changing between low and higher magnification objectives. The discomfort, and potential damage, that is caused when the eyes are exposed to sudden changes in light intensity is eliminated in this design.

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The ocular lens provides additional magnification and is adjustable. Users can turn a knob or move the binocular lenses (on microscopes with two eyepieces), mimicking the adjustments the natural lens in our eyes makes to see objects at different distances. This way, users with different levels of eyesight can manipulate the eyepiece to focus the image provided by the objective lens.

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Now, portable, lightweight microscopes have objective lenses that work together with cameras on mobile phones to provide magnification. Using phones with portable microscopes adds the ability to capture magnified images and send them to databases for analysis or store them in the cloud or locally on the phone for future examination.

The first step is involving kids in understanding scientific research methods. They should understand the instruments that help scientists make discoveries, engineers make micro-machines, technologists understand tiny chips, and artists interpret the world they see and hear through artistic expression.

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Lowered stage assemblies, in recent instrument designs, have heights ranging from approximately five to eight inches, considerably lower than those found on previous microscopes. Many also incorporate space-saving dual pulley or pulley and guide rod systems that replace older rack and pinion mechanisms to govern stage movement. Some models feature focusing adjustments that translate the nosepiece, rather than the entire stage, to maintain a constant stage height, reducing the amount of forearm movement necessary to move the stage or change the specimen. More advanced designs eliminate protrusion of the x-directional guide from the side of the stage, thus reducing interference with focusing action. Rotational movement of modern stages often exceeds 200 degrees and some can even achieve over 250 degrees of rotation about the microscope optical axis. Any microscopist who has spent time framing images for capture on film or by digital imaging will appreciate this advanced feature, which not only saves time, but eliminates a considerable amount of frustration.

In addition to simply capturing reflected light to render an image, the objective lens of a microscope magnifies the image. Many stationary microscopes have several objective lenses that the user can rotate to view the object at varying levels, or “powers,” of magnification.

Similarly, the objective lens in a microscope captures and refracts the light reflected from an object, even a tiny object suspended in a drop of water. The refraction of light through the objective lens creates a focused and magnified image of the object you’re looking at.

Most microscopes used in schools and labs have at least two, and usually more, lenses. Objective lenses are the lenses that directly observe the object the microscope user is examining. In stationary microscopes, the objective lens then focuses reflected light from the object up a tube toward the ocular lens, which is the lens the user looks through.

The tutorial initializes with the automatic nosepiece feature of an ergonomically designed modern microscope (the Olympus BX45A) appearing in the window. In order to operate the tutorial, use the Swap Objectives button to toggle between the 10x and 40x objective and simulate how these components are rapidly interchanged through the use of a remote hand or foot switch.

The ergonomic design of stress free microscopes that are easy to operate is a primary goal for all of the manufacturers. This interactive tutorial examines the automatic objective changeover design in clinical microscopes, a feature that is quickly performed with a foot or hand switch to reduce the frequency of repetitive hand motion and ease operator discomfort.

Perhaps the most significant feature of new compound microscope designs is positioning of the stage translation and focus control knobs in an equidistant configuration from the operator (Figure 1). This allows a more relaxed posture with the hands resting comfortably on the desktop. In addition, operators are no longer required to twist their shoulders to simultaneously manipulate the stage and focus controls, considerably reducing the amount of strain associated with long-term observation. Other frequently used microscope controls, such as the field diaphragm, light intensity potentiometer, and auto-illumination photomicrography preset switch, are located in the front of the microscope base at desktop height and within easy reach of the operator (see Figure 1 for details). Push-button filter engagement levers are also positioned near the main controls to further enhance operational ease. Many microscopes are equipped with a refocusing stopper that allows quick change of specimens with an instant return to focus. In addition, coarse focus tension controls allow the operator to customize the action of z-direction stage translation to suit individual preferences. A few microscopes also offer detachable fine focusing knobs that can be fitted to either side of the instrument to suit the operator's preferences, and some knobs are coated to enhance traction and allow easy operation with only a single finger.

Muscles in the eye adjust the shape of the lens to focus correctly depending on what we’re looking at and how far away it is.