Why do photo cameras lose focus when you zoom, when movie or TV cameras keep it? – photo.stackexchange.com

Why do photo cameras lose focus when you zoom, when movie or TV cameras keep it? – photo.stackexchange.com

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In photo cameras, i.e. (D)SLRs, digital cameras, etc., when you focus on an object and then you zoom (in or out), the object gets out of focus. On the other hand, in movie or TV cameras, the focus is ...

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