You can have the best equipment in the world with the best lighting and background but the most important bit is making your subject feel relaxed. I have watched other photographers photograph people and its made me realize how not to do it. I would give this experiment a go. Choose someone you would like to photograph who hates sitting for a formal portrait. See if you can get a great image out of them, If you can't try a 200mm end of a zoom lens and give them someone to talk to. You should find they start to relax, then move to 135mm on your zoom lens and get a bit closer. You should be O.K with most average people at this focal length.
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