This is a high-quality s16mm film lens and often the go-to lens for s16mm film work.
Canon called these lenses variable primes and they are optical to the standard you would expect from prime lenses.
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Canon 11 - 165mm T2.5 Super 16mm Zoom Lens. Works great with cameras like the Sony Alpha, Blackmagic Pocket Camera, The Blackmagic Ursa Mini Pro (mini) in 2k and HD crop mode, The Red Epic Dragon in 2.5K crop mode, The Arri Amira in HD super 16mm center crop mode, Z Cam E2 F6 and F8, or any other sensor that can crop to a super 16mm sized area.