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How to use the duvet 1. When used, add a coat to protect the down. Flatten the quilt after getting up in the morning to keep it fluffy;
2. Constant air ventilation, can keep the freshness of down. Drying is usually once every 1-2 weeks;
3. Avoid direct sun exposure and humid environment;
4. Lightly shake the duvet to make down more fluffy and ensure the fresh air enters;
5. Do not use a vacuum bag or beat the quilt continuously. It will easily damage the fabric and fragile down.
6. To avoid dull quilt and hard tip friction, so as not to wear, break through the fabric caused by feather overflow. If necessary, use a soft brush to handle the surface fabric;
7. When used for the first time, there may be feathers to pierce the table cloth. This is a normal category and it is not a product defect. The woven pores will close during use.
8. Before long-term storage, it is necessary to dry for 2-3 hours. After reposing, gently beat the surface dust and gently shake the quilt up and down. After the quilt is allowed to cool, fold it again and store it. The storage should be kept dry.
Focal length of automotive camera lens parameters.
The focal length determines the size of the field of view Angle. The focal length value is small, the field of view Angle is large, and the observed range is large, but the distant object is not clearly resolved.Large focal length, small field of view Angle, small scope of observation, as long as the appropriate focal length selection, even distant objects can be clearly seen.Since the focal length and the field of view are one-to-one correspondence, a certain focal length means a certain field of view. Therefore, when selecting the focal length of the lens, it is necessary to fully consider whether it is important to observe the detail or to have a large observation range. If you want to see the detail, you should choose the lens with a long focal length.If you're looking at a large scene up close, choose a wide-angle lens with a small focal length.
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