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Stephen: Hey, Evelyn, long time no see. How are you getting on? Evelyn: Every thing is great! I happen to have a question to ask you, are you free now? Stephen: Yes, it’s my pleasure.

Evelyn: Stephen, are you free now, can we talk about lens coating? Stephen: Sure, any confusion? Evelyn: I can fully realize that coating can provide us a brighter image, but I don’t know why and how.

The L/D ratio is the ratio of the length of the screw to its outside diameter. The ratio calculation is calculated by dividing the length of the screw by its nominal diameter.

What will the future development of shoe machinery companies look like?

There are many manufacturers of TPU injection molding machine in China. According to incomplete statistics, there are more than 20,000.

Are you having trouble choosing an optical product? Are you confused about which optics to use at different distances? What kind of scenarios are different optical products suitable for?

LPVO（Low Power Variable Optics） is very popular in whatever hunting, tactical or competition for AR and carbine users. It helps to turn your rifle into both short-range and long-range solution for shooting.

Stephen, for .22 LR and several other small ammo calibers, many scopes' elevation can't adjust to zero center, especially when using high magnification scopes with less adjustment range.

The rubber industry is widely used. Some products are not standard or have different shapes. The rubber shaped parts that they are equipped with are also different.