Monthly Archives: October 2020

The emergence of mobile power has undoubtedly alleviated the problem of insufficient power consumption of smart terminals at this stage. The portable and movable characteristics of mobile power have brought us great convenience. The mobile power supply is now a portable product. On the basis of ensuring the product capacity, how to reduce the volume of the product and make the product more compact and easy to carry is one of the trends in the technological innovation of the appearance of the mobile power supply! Secondly, how to apply advanced industrial design concepts and even humanistic concepts to the appearance design of mobile power supplies to make mobile power supplies feel more comfortable and fashionable, which is also the trend of mobile power technology innovation. Power bank with built-in charging cable. For users, in addition to being able to charge digital products, mobile power users also need to pursue the portability of mobile power. Therefore, a mobile power supply with a built-in charging cable came into being. With the built-in charging cable, users can no longer worry about not being able to find a charging cable and adapter. This built-in three-in-one mobile power product has built-in Apple charging cable, MICRO charging cable and MINI charging cable, which is compatible with most mobile phones on the market. A mobile power supply with LED lighting and charging function, which is currently the most common on the market. The advantage is that this type of mobile power supply has a large capacity and is equipped with LEDs to facilitate lighting in low light conditions, which is very suitable for professional external power supplies.

Mobile power supply is a power product that can be carried by individuals, can store electrical energy by themselves, and can charge mobile devices, especially handheld devices (such as mobile phones, tablet computers, etc.). Mobile power is usually used in occasions where there is no external power supply. Its main components include batteries that store electrical energy, charge management circuit, discharge management circuit, etc. Typical products are DC 5V input and DC 5V output. The product structure of mobile power is relatively simple, mainly composed of three parts: storage medium, circuit board and shell. Among them, there are two types of storage media: polymer batteries and lithium batteries. At present, most mobile power supplies use lithium batteries, and among them, 18650 batteries dominate. The output voltage of a single 18650 cell is between 2.7-4.2V and the capacity is 2600m Ah. In order to increase the storage capacity of the mobile power supply, the method of connecting multiple battery cells in parallel is usually used, so the nominal capacity of the mobile power supply is generally a multiple of 2600mAh. The working voltage range of the battery of electronic digital products is also 2.7-4.2V. In order to be able to charge it, there must be a boost circuit inside the mobile power supply to increase the output voltage to 5V before discharging. Correspondingly, the charging voltage (i.e. input voltage) of the mobile power supply is also 5V, and DC charging is carried out through an external power adapter or a computer USB port

Tripod is basically divided into four kinds of material: aluminum alloy, plastic, carbon fiber, iron, these four kinds of material tripod, the current market is the mainstream of aluminum alloy carbon fiber. The biggest advantage of carbon fiber tripods is that they are light in weight and not too brittle in hardness. In addition to weight, the stability and durability of carbon fiber tripods are negligible compared with other tripods. But it will cost more than half as much as a regular aluminum tripod made of iron.

According to the choice of tripod material divided into two cases, the first is rarely indoor shooting with a tripod running around, it is recommended to choose the iron tripod, because it is cheap, and stability, hardness is not bad; The second is the brigade to beat more, to carry the tripod to often run around, then you need to choose carbon fiber, because light, but more expensive than iron.

Tripod from the purpose can be generally divided into professional tripod, brigade shooting tripod, desktop tripod, camera tripod.
Professional tripod and brigade beat tripod height is basically more than 1.5 meters, the foot tube is generally in three or four, bearing more than 10 kilograms.
Desktop tripod is more popular in recent years in network anchors or we media shooting, generally only 1-2 tube, or no, in fact, is a reduced version of the tripod, in addition to the height of qualified desktop tripod and professional tripod function is similar. Camera tripods are mainly used for shooting videos, which are rarely used or even seen by ordinary people. Most of them are used for shooting movies, TV shows or some news organizations. The specific height of the camera tripod can be higher, the foot of the bracket for the horseshoe foot, this foot has a strong grip, load-bearing capacity is higher than ordinary cameras, placed in the medium and large shooting equipment.

Wireless Bluetooth headsets are more to meet the needs of convenience and multiple functions. This is not to say that wireless Bluetooth headsets have no sound quality, but that compared to wired headsets of the same price, wireless Bluetooth headsets have more room for improvement in sound quality. In addition, the article will not do too much analysis on the sound quality of each wireless Bluetooth headset, only a rough comment. In my opinion, the concept of sound quality itself is very metaphysical. Different people have different ear canals, and they have different hearing feelings for the same equipment and audio. For example, a pair of affordable headphones that are confirmed to have a noise floor, not everyone can hear the noise floor. Everyone has different sensitivity to different frequency bands. This is why the fungus is said to be.
Among the parameters of wireless Bluetooth headsets, the most noteworthy ones are related parameters that affect the headset sound quality, Bluetooth stability, and headset delay control.

How to choose an iPhone charger? In fact, iPhone supports two charging protocols.
One is the Apple protocol. Apple phones generally support up to 12W charging power, which is supported by all iPhones.
One is the PD protocol. Models after iphone8 are compatible with this protocol. Except for iphone11, all models support up to 18W charging power. The three models of the iphone11 generation support up to 22W charging power.
To charge using Apple protocol, you need a charger that supports Apple protocol and a USB-A to Lightning data cable (the original data cable)
To charge using PD protocol, you need a charger that supports Apple protocol and a c to l data cable

3D glasses are divided into three types

1. Spectroscopy: the different polarization angles of the polarized lens make the left and right eyes see the corresponding picture respectively. It is divided into IMAX system and RealD system, but the cost of IMAX system is higher, so RealD system has a larger market share, and RealD currently has more than 80% of the North American market.
2. Color separation system: from the earliest red and blue lenses to the current Dolby color separation system; the price is not high, but the red and blue lenses are eliminated in current theaters. If it is a red and blue color separation movie downloaded at home , You can use this.
3. Time-sharing system: it is the electronic shutter system. By alternately opening and closing the left and right eyes, the left and right eyes can see the corresponding pictures respectively. Xpand is an electronic shutter type, which is more expensive and has better results.

3D glasses in movie theaters are generally made of polarized lenses, and the cost is not high, but the projectors that play 3D movies must also have a pair of polarized lenses to see the three-dimensional effect through polarized lenses. If you wear this kind of glasses to look at the LCD/LED display screens of ordinary computers or mobile phones, most of them are bright and dark, and the colors are not accurate. Some 3D TVs use polarization technology, which is similar to movie theaters. They play 3D format film sources (three-dimensional Blu-ray DVD), and use the correct polarization glasses to see the three-dimensional effect. The principle of polarized glasses is the same, but the products of each factory may not be unified and may not be universal. There is also an active stereo glasses that directly control the occlusion of the left and right lenses. The field of view is brighter, but the glasses are bulky and require batteries and a signal source. On a computer, the control signal is obtained through an IR jack on the graphics card. Use infrared or directly connect to the glasses to control. To view this kind of image, you need a corresponding graphics card and glasses, as well as a monitor with a relatively high refresh rate. It is generally used for high-end games or some scientific research projects. It is estimated that there are not many movies that support this format.

From the perspective of the scene, you can complete the idea of shooting by choosing the venue, choosing the right time, and adjusting the composition. You can also use props to enrich the story and creativity of the scene. In terms of equipment and parameters, the first thing to do is to face the choice of lens focal length, exposure setting, and viewing angle. Each choice corresponds to a different result, and a different style can be formed. If the light on site is not satisfactory, or if you want to get the light that is difficult to obtain directly in real life, artificial lighting is necessary at this time. The photographer's job is to plan all these issues. But often, not everyone can be brilliant in all aspects. There are so many directions mentioned above. Only one or two are needed to be distinctive or brilliant. It is not too wrong. In fact, it is fine. After all, there is no perfection in the world. thing. So the flash is actually just one of the many ways to enhance the picture.

As an auxiliary tool, flashlight is basically indispensable in commercial photography, regardless of portrait products, cars, etc., and in ordinary personal creation, it should be determined according to your personal needs. There are many things that can be discovered and shining in a portrait work. From a model point of view, you can create works from expression management and action performance, or express with makeup skills and clothing matching. From the perspective of the scene, you can complete the idea of shooting by choosing the venue, choosing the right time, and adjusting the composition. You can also use props to enrich the story and creativity of the scene. In terms of equipment and parameters, the first thing to do is to face the choice of lens focal length, exposure setting, and viewing angle. Each choice corresponds to a different result, and a different style can be formed.