Okay, thanks. I went to another site and found the answer. What I don't need are buttons/settings that 'do' something but have no real function. In this case it appears to be more of an editing function.
Why have it? Except in extreme circumstances, it replaces interchangeable lenses cheaply but rather not so well. When to use it? Rarely. Only under duress. Why do they put them on cameras? People like a button that seems to 'do' something, I think.
My question was more about the actual function itself, not so much about the act of 'zooming' or whether or not it should be done. I understand that you are saying digital zoom is for an extreme circumstance of needing to shoot something that is out of normal range.
Um, frankly I don't know why you would want a digital zoom. It eats up battery life and I can't think of much use for it. You can change the focal length on your shots (NOT while you are recording!!!). you might want to 'zoom in' (ie, get closer) when you are shooting something you can't physically get closer to (ie, a lion eating a tour guide or something like that). You want to avoid 'zooming' into things as a rule though. It compresses the depth of field and it magnifies even the slightest camera move. Under no circumstances (unless it is on purpose and for some kind of 1960s hand held documentary film effect), should you zoom while recording.
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