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A camera bag is necessary, which can protect the camera, and can also hold accessories such as UV mirrors and batteries.

UV mirror is to add a layer of high transmittance coated glass in front of the lens to protect the lens;

I don't know what you are talking about. Generally, there are CPL mirrors, that is, polarizers, which are used to filter the disorderly reflected light of the subject. There are filters, gradient lenses, grey mirror and so on. You can search online and have a look;

The main index of SD card for SLR is the transmission speed, preferably not less than 20M/S, or higher. The size of the card depends on yourself. If shooting, generally not less than 8G, or16g; .

Tripods are generally used in dark places. Depending on your own needs, tripods are usually equipped.