Think the advice above is spot on when choosing lenses its best to think how much of the back ground you want in the shot with the larger zoom lenses you are going to get a tighter shot and would let you get farer away so you could give the person room to feel comfortable. But as its a group shot you probably need the wide angle
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You cant fool all of the people all of the time, some of the time all of the people will some of time but not all of the time as some of the time all of the people will some of the time but all of the people will not all of the time
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