Zoom creep

Zoom creep is a phenomenon in zoom lenses where the angle of view of the lens changes when gravity is allowed to freely act on it.[1] If the lens has a zoom ring, holding it when the lens is held upwards or downwards will prevent this change. In lenses with push-pull zoom, creep is prevented by holding the extending part of the lens. Some lenses, such as the Tamron SP AF 17-50mm f/2.8 XR Di II LD Aspherical [IF][2] and Canon EF-S 18-135mm f/3.5-5.6 IS STM,[3] have a zoom lock to stop the effect.

References
  1. https://support.nikonusa.com/app/answers/detail/a_id/13918/~/what-is-zoom-creep%3F
  2. "SP AF 17-50mm F/2.8 XR di II LD Aspherical [IF]". 3 April 2020.
  3. "Canon U.S.A., Inc. | EF-S 18-135mm f/3.5-5.6 IS STM".
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