Some helmet lenses are black, which can block ultraviolet rays, and some are black, which just looks black and has no UV blocking function.
First, the helmet lens is black and belongs to the filter lens. It is the cheapest accessory that can obviously change the appearance of photos.
The function of helmet lens is as follows:
It can prevent dazzling and reduce eye fatigue, improve resolution and play a certain role in heat insulation.
Secondly, for color photography, several basic compensation filters should be prepared, as well as several special effect filters mentioned later.
Third, if you want to achieve something in black and white, you are suggested to bring three basic filters in your camera bag: medium yellow filter, light green filter and red filter.
Cleaning of the interior of the helmet When the helmet is used for a long time, dirt will often accumulate in the interior of the helmet and produce an odor. In this case, it should be cleaned. It is better to use neutral detergent, and better to use shampoo. In order to avoid peculiar smell left by the detergent, its usage should be controlled. Do not use too much force when washing the inside of the helmet.
Otherwise, the cushion material will deform and lose its cushioning function. After cleaning, wipe off the water with towel or paper towel and place it in a ventilated place for natural air drying. Do not use a hair dryer.
Our helmets need to be cleaned frequently. It is very important to keep the helmets clean. I hope it will be helpful to everyone.
Some foam cushioning materials for helmets have very low density, which is even worse than the foam cushion used for home appliances. It will break with a light hand digging - unqualified.
Some materials of the lining are uncomfortable to touch. Pay attention to the selection.
Be careful that the small black heart factory uses recycled materials to make helmets. The helmets will break if you drop them gently. They will smell and soften when the sun shines, and may contain some toxic and harmful substances in the garbage during recycling. Because this kind of helmet is super cheap, many people buy it. For safety, we must not be greedy.
How to choose Motorcycle helmet Safety helmets must be worn when driving and riding motorcycles, which is a clear provision of China's road traffic management regulations and an important measure to ensure the safety of motorcycle drivers and passengers. If you wear a helmet, you should wear a helmet that really has safety protection performance. Therefore, it is very necessary to master some knowledge of safety helmets, purchase a helmet with safety, and use and maintain the helmet correctly.
1、 The construction shell of the safety helmet The shell of the helmet plays an important role in the safety of the helmet, so the selection of its material is very important. Average. The materials used are ABS and glass fiber. Good helmets are made of carbon fiber, but they are expensive.
The main function of the buffer layer is to absorb external impact. Imagine that if the helmet with a hard shell has no buffer layer, when encountering an external impact, the external force will directly act on the head through the hard shell, causing damage to the head. Therefore, the buffer layer thickness and material quality determine the buffer capacity of the helmet. The buffer layer is mainly made of foamed styrene.
The inner lining is mainly used to enhance the comfort when wearing, and is generally made of soft flannelette.
The hat belt is used to fix the helmet firmly on the head. The combination methods are: snap type, ring buckle type and cloth sticking type.
The jaw protection is part of the helmet, that is, the part below the nose to protect the lips and jaw is added to protect the face from impact. Full helmet helmets are generally available. Air inlet and air outlet.
Protective glasses Protective glasses can protect the eyes and face. They are made of plastic (such as polycarbonate resin) and reinforced glass (such as PMMA resin), among which the scratch resistance of the reinforced glass is very excellent. It is suggested that the reader should choose the goggles made of better materials as far as possible, because poor materials are easy to break and stab the face when hit.
