Focus changing size of subject?

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johnnynice New Member • Posts: 12
Focus changing size of subject?

There is a term I am looking for, which I completely forget, and google is not being helpful. It is a term used to describe an anomaly of lenses - when you change focus, say from something farther away to something closer, the size of what is in focus changes.

It is applicable to video, as it causes the image to look jumpy when changing focus. Does anybody know the term for this? Thank you.

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