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Stereo Microscope An Optimal Balance

Stereo Microscopes are often referred to as the main force of laboratories or production departments. What factors do you need to consider when choosing a stereomicroscope? The answer is: "look at the situation". This is why? Because it depends on the use, depending on the user wants to complete the task. A stereomicroscope is basically a tool for enlarging a three-dimensional object in three dimensions. Unlike a microscope, a stereomicroscope can cope with this task.

The past binocular microscope, which is characterized by a simple lens system, and the design and the traditional double microscope the same. Such dissociative microscopes, as they were well known at the time, were primarily used for anatomical purposes in biology; there was no technical application at the time. In about 1890, American biologist and zoologist Horatio S. Greenough used a design principle that is still used today for all major manufacturers of optical instruments. "Grignard principle" based on the Stereo Microscope, to achieve a real high-quality three-dimensional images.

In 1957, American Optics used a modern Stereo Microscope with a common objective lens and named Cycloptic®. Its modern aluminum shell is under the path of two parallel beams and the main objective, as well as a five-step scale. Such a stereomicroscope, in addition to the use of Grignard principle, but also the use of telescope or CMO (ordinary main objective) principle, and for modular, high-performance equipment. Two years later, another American company, Bausch & Lomb, presented the StereoZoom® Grignard design, which made groundbreaking innovations: one-step magnification (zoom). Today almost all of the designs are based on a zoom system.

Standard for selection of stereomicroscopes

Today, Stereo Microscopes are still based on the technical approach mentioned - the Gleno or CMO principle.

Four matters need to be carefully evaluated:

A) What is the use?

B) Which structure needs to be observed, recorded or visualized?

C) How many people are using a microscope?

D) What is the available budget for the solution?

Once the above factors are known, it can be attributed to the following criteria.

Magnification, zoom range and object field

Depth of field and numerical aperture

Optical quality and working distance



Magnification, zoom range and object field

The total magnification of the stereomicroscope is a combination of magnification, objective and eyepiece magnification.

Zoom or zoom body

Like a magnifying glass, the magnifier is made up of an optical lens and can be used to change the magnification of the instrument. Changing the position of the magnifier changes the degree of image magnification. The degree of image magnification is called the magnification. Modern Stereo Microscope can provide 16 times magnification (only zoom body), 20.5: 1 zoom range, which is characterized by a reliable measurement can be motorized or encoded.

Depth of field and numerical aperture

In the microscope, depth of field is often regarded as an empirical parameter. In fact it is determined by the correlation between numerical aperture, resolution and magnification. In order to obtain the best visual impression, the modern microscope adjustment facility produces an optimal balance between the depth of field and the resolution - theoretically negative two parameters.

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