What Is a Loupe?

Magnifier definition: Magnifier (English name: magnifier): Simple visual optics for observing minute details of an object. It is a condensing lens with a focal length much smaller than the apparent distance of the eye. The size of the object imaged on the retina of the human eye is proportional to the angle (angle of view) of the object to the eye.

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Magnifier definition: Magnifier (English name: magnifier): Simple visual observation for observing small details of objects

To see tiny objects or details of objects, you need to move the object closer to the eye, which can increase the angle of view and make a large real image on the retina. However, when the object is too close to the eye, it cannot be seen clearly. In other words, we must be aware of not only the opening angle of the object to the eye, but also the proper distance. Obviously for the eyes, these two requirements are mutually restrictive. If a convex lens is arranged in front of the eyes, this problem can be solved.

Observation method 1: Keep the magnifying glass close to the object to be observed.

The previous number of the magnifying glass indicates the magnification. For example, 8X30 indicates that the magnification of the magnifying glass is 8 times.

If it is a double type, separate the two numbers with a / sign. For example, 2x / 4x means that the magnification of the magnifying glass is 2 times, and there is an area in the magnifying glass that is 4 times. If the lens is rectangular, use the previous number to indicate the width of the lens and the next number to indicate the height of the lens in millimeters. For example, 100X50 means that the width of the lens is 100 mm and the height is 50 mm. Like telescopes, inferior magnifying glasses like to work on magnifications. The nominal magnification is often much higher than the real magnification. In fact, the common magnification of single-lens magnifier is below 10 times, and the common magnification of double-lens magnifier is below 20 times. If high magnification is required, a microscope is needed. Different occasions require different magnifications. It is not that the higher the magnification, the better. A higher magnification means a smaller field of view. In some cases, the field of view is more important. (Magnifying glass multiple = 250 / Lens focal length +1, mm unit)

According to appearance classification, the magnifying glass can be divided into portable magnifying glass and desktop magnifying glass. The desktop magnifying glass can be fixed. There is a base below and a magnifying glass above. The shape of the magnifying glass can be rectangular, square, or round. The magnifying glass is mainly used for long-term fixed looking at a place.

The tabletop magnifying glass can have a long mirror arm and a curved place. You can change the position at will according to your needs.

The portable magnifying glass is just like the one above, one round magnifying glass in front and one behind

Windows7 Magnifier

Windows 7 has added a "magnifying glass" function, which is a convenient gadget that can zoom in on any window page.

Windows7 Magnifier

This "magnifying glass" can be used in any window, click Start magnifying glass in the lower left corner of Windows7, and then you can use it. If you don't use the "magnifying glass", it will automatically be reduced to a magnifying glass icon on the right. Double-click it to zoom in randomly, but you cannot use it to zoom out. Generally, the maximum magnification can be 16 times, and it is best not to put it too large, which will cause troubles such as being unable to recover.

Features: Magnification: 25, 50, 100, 150; with clear imaging, simultaneous observation and measurement, compact structure, easy to use, beautiful appearance

The main purpose:

· Used in financial, fiscal and taxation, philately, electronics industry to observe banknotes, tickets, mail, coins, paper and printing outlets. Can accurately and quickly identify counterfeit banknotes, with extremely high resolution and inaccurate detection by purple light, use this instrument

It can accurately identify the real Renminbi under this microscope. The pattern is clear and the lines are continuous. The pattern of counterfeit banknotes is mostly composed of dots, the lines are incoherent, and the color is light, fuzzy, and no three-dimensional.

· Used in the jewelry industry, to observe the internal structure of gems, cross-section molecular alignment, and to analyze and identify ore specimens and cultural relics

· Used in the printing industry, it can be used for fine plate, color correction and halftone dots, and observation of edge extension, can accurately measure the screen mesh number, halftone dot size, overprint error, etc.

· Used in the textile industry to observe and analyze cloth fiber and warp and weft density

· Used in the electronics industry to observe the traces and quality of printed circuit board copper and platinum boards

· Used in the observation and research of bacteria, insects in agriculture, forestry, food, etc.

· It can also be used for animal and plant specimens, identification and analysis of evidence by public security departments, scientific experimental research, etc.