1. If you go to Hong Kong and you are not familiar with it, you may not be able to find Yingcheng, dcfever, Henghui, Broadway, Fortress, etc. in Mongkok. Moreover, if you go there and there are no activities, there will be nothing. For the price advantage, it is better to go to Taobao to buy or purchase on an agent. The price is probably cheaper than buying it yourself in Hong Kong. This is my experience of buying electrical appliances in Hong Kong and Japan. It is really not as good as Taobao.

2. When buying something, you can generally use your credit card multiple times to raise money, but sometimes the merchant may not agree because there is a handling fee.

3. When you bring a lens back and enter the country, there is usually a tax-free limit, which seems to be HK$5,000 per person. But in fact, you only need to throw away the packaging, receipts, etc., and no one will check you when you bring back only the lens. Except for passing the test occasionally, it is not very strict.