How to choose a biological microscope?
(1) Microscopes can be divided into monocular, binocular and trinocular microscopes according to the number of eyepieces used. If general users have relatively simple requirements and just want a cheaper microscope, then choose a monocular microscope. Generally, a monocular microscope It is more suitable for elementary school students, middle school students, some small clinics, and parents to buy it for their children. It is used more and the price is more affordable.
(2) Optical part: The core of the quality of the microscope is its optical part, that is, the eyepiece and objective lens. For objective lenses, it can generally be divided into several levels. The first is the achromatic objective lens. With this objective lens, not all areas of the image are clear, only about 60% of the field of view is clear, and the outer 40% of the area will have certain defects. Usually we put the observation part in the field of view, so it does not affect the observation. But if you want to have no defects in the field of view, you need to use a plan achromatic objective lens. Relatively speaking, the price of this kind of objective lens will be much higher, and it is generally used in medical and scientific research. There is also something in between, that is, the semi-plan achromatic objective lens. For the microscope used by students, it is enough to choose the first two levels.
(3) Structural materials: The service life of the microscope is very long, some can reach more than 10 years, so high-quality parts and tight assembly become the guarantee of its service life. Therefore, a microscope with a solid and sturdy frame should be selected, and the material selection is alloy to reduce deformation. In addition, the lens should be made of optical glass, and the outer paint layer should be smooth and uniform. Also make sure that the microscope you buy is produced in accordance with the relevant general standards, so that you can easily buy it when you want to buy related accessories in the future.
(4) Light sources: There are generally three types of light sources for microscopes: tungsten filament lamps, fluorescent lamps, and halogen lamps. Tungsten filament lamps are also incandescent lamps. The advantage of this type of lamp is that it is cheap and can provide a stable light source. The disadvantage of trying it out is that the light emitted is obviously yellow, which will affect the observation. In addition, it generates too much heat, which will affect some materials when observed for a long time. Therefore, if the microscope is a tungsten lamp, the price is relatively cheap. Fluorescent lamps can provide a light source similar to sunlight, and generate very little heat. Moreover, fluorescent lamps with the same power are much brighter than incandescent lamps, so fluorescent lamps will save electricity. On the other hand, it is more expensive. The general price is more than 10,000 for the whole family, and some are 20,000 to 30,000. Imported ones are even more expensive. Halogen lamps can provide a very bright and white light source. Generally, the price will be more expensive when equipped with a microscope, so for colleges and universities, it is not necessary to choose it.
