12-20-2018 11:58 PM
12-21-2018 08:46 AM - edited 12-22-2018 11:22 AM
That does not sound quite right. It might need service.
The zoom ring of the lens is completely independent of the lens mount. It should not matter which camera is attached, [nor] if there is not one at all.
However, the lens does have a friction adjustment on the zoom ring, so check that first.
12-22-2018 12:50 PM
The only thing I can think of is this lens has a tension ring for the zoom. You can use this to snug the zoom to avoid "zoom creep" (unintended changing of the zoom). If that was a bit too snug... maybe it was refusing to move. It should easily run the full zoom range if the tensioin ring is the loose position.