The telescopes sold in the market are a mix of fish and dragons, with a variety of strange and varied prices. When choosing, one always looks dizzy and doesn't know how to make a decision. So how do we choose the desired product? The following content is hoped to help everyone.

1. Look at the specifications and models

The specifications of a binocular are composed of the magnification of the telescope and the aperture of the objective lens. Optical products have a certain scientific basis, and the combination of parameters must also have relevant scientific basis, and is not imagined out of thin air. In daily life, sometimes we hear friends say, 'I want to buy a telescope with a size of 45x, 30 caliber, or even a size of 100x, 25 caliber.'. After consulting and understanding, I found out why some friends come to inquire about products in this way. Firstly, the customer's perception of telescopes is that the larger the magnification, the better. Secondly, they are afraid of inconvenient portability, and the smaller the aperture, the better. So friends who understand telescopes must know that this is an unscientific and unfounded parameter and statement.

After talking so much nonsense, knowing that everyone should be in a hurry, I silently thought to myself, what are the common specifications for telescopes? The common specifications for handheld telescopes include 6x30, 7x35, 7x40, 7x50, 8x21, 8x30, 8x42, 10x42, 10x25, 10x50, 12x42, 15x50, etc.

Apre Hd4210

Product Introduction:

The APRESYS H series telescope body is wrapped in a magnesium aluminum alloy inner liner with anti slip composite rubber, which is anti slip, anti drop, and durable. The recent focusing distance is 2.5 meters, and the lens tube is filled with nitrogen gas, which is waterproof and dustproof. It is suitable for all-weather use and is the best choice for hiking and light watching competitions. Perfectly natural, portraying a lightweight legend!

The aperture of a telescope is one of the important factors in the observation effect. A telescope with the same magnification, the larger the aperture, the more light it collects. This allows more light to enter the human eye, making it more comfortable to watch. For example, compared to the 7x35 and 7x50 models, the 7x50 model definitely looks more comfortable to the eyes. No one is perfect, no gold is perfect, and larger apertures have more brightness. However, one drawback is that a 50 caliber telescope has a slightly larger volume than a 35 caliber telescope. So whether the volume is larger or smaller, it is something that people can hold, and ultimately it depends on the needs of friends themselves. Another point to add is that some friends often ask if telescopes can be used at night? Telescopes can be used in low light conditions, but telescopes with small magnification and large aperture will perform better in low light conditions. Among the above models, the 7x50 model performs well in low light conditions.

2. Look at the material

A. Look at the shell material. Telescope body materials generally include all metal, semi metal, semi plastic, and all plastic. The military telescope adopts an all metal body structure, which is sturdy and durable. It is armored with cadmium sulfide or rubber skin, with shock absorption and anti slip design. It has strong ability to withstand bumps and vibrations, and can withstand more than 20 gravitational accelerations, fully adapting to field environments. Civil telescopes generally use plastic body structures, which are not as sturdy and durable as military all metal telescopes, so all metal telescopes have a longer lifespan.

B. Look at the prism material. Telescope prisms are generally divided into K9, K7, and K4, which have different refractive indices. K4 prisms have the highest refractive index, and when not considering the absorption amount, it can be said that K4 reflects 100% of the incident light. Therefore, K4 has high optical efficiency, but its price is also expensive. Military telescopes and some high-quality telescopes use K4 (Bak4) prisms, and most civilian telescopes use K7 and K9 prisms with lower refractive indices. So you can see the same type of telescope on the market, but the prices are different because the materials used are different and the costs are different.

C. Look at the coating. The quality of optical effects is definitely related to the coating condition, as the function of coating is to reduce the reflected light that shines on the telescope lens. Generally, coating is only applied to the outer surface of the telescope lens; A good coating is very meticulous and meticulous, covering each lens of the telescope with multiple layers of coating. For example, the 98 style 10x50 and 98 style 7x50 from reputable manufacturers use polycrystalline coating, which makes the imaging quite transparent. At different angles, the visible lenses will reflect different light. Coating technology is not a day long process or an ordinary technology, so it is also one of the reasons why telescope prices differ significantly in the market.

3. Look at the price

People often say that you get what you pay for, but they always want to buy the highest quality products with the least amount of money, that is, using the price of cabbage to buy meat, which is definitely not feasible. If the merchant describes the quality and effectiveness of the product as valuable as a piece of gold, but sells it to you at the price of silver, then you need to think more. It seems that you have obtained a cheaper price, but in reality, you may have bought a piece of iron with the money you paid for silver. Products of the same quality within a certain value range can have a maximum price difference of only tens or tens of yuan. In short, it is still important to seek truth from facts. Don't think about buying products worth 2000 yuan for 200 yuan, and don't believe that products worth 2000 yuan will be sold for 200 yuan.

4. See the effect

Looking at the effect is a very direct method. Firstly, check the resolution of the telescope; Secondly, check if the telescope is ghosting and ensure that the distance between the two cylinders matches the distance between your pupils. When the two circles of the telescope are adjusted so that both eyes are in the same circle and in the same plane, the telescope is normal. If the two eyes cannot be adjusted so that they are in the same circle, it may be ghosting, which may not be suitable for your pupils, or it may be due to improper adjustment by yourself; Finally, we need to check if the color difference is serious.

5. Look at the workmanship

The general craftsmanship can be judged from the product's appearance, seams, decorative leather, and whether the paint is finely crafted. If the workmanship is not good, it's hard to tell. Just compare it with other products and you'll know. What we often come into contact with is the clothes we need to wear every day, the texture of the fabric and the handling of the thread, and we have a clear idea in our minds. The same goes for telescopes, but for friends who first come into contact with telescopes, there is still some difficulty, so doing anything requires accumulation, and only in the end can dripping water pierce the stone.