What you should know about the telephoto lens, it is worth collecting 01.How to choose a telephoto lens? 02. If you want to do a good job, you must first use it 03.Is it enough to hit the bird 300mm? 04.500mm long is not long? 05.Do you want a teleconverter? 1. Use telephoto for metering 2.Use a tripod 3.Use a hood 4.Use a ranger 5.Make good use of the compression effect of telephoto 6.Use telephoto to make depth of field

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