The following Reolink Cameras support optical zoom function:
Applies to: C2 Pro, E1 Zoom, E Series E340, E1 Outdoor, E Series E540, E1 Outdoor PoE, E Series E560P, E1 Outdoor Pro, E Series E560, RLC-422-4MP, RLC-422-5MP, RLC-423 Series, RLC-511, RLC-522, RLC-811A, P430, RLC-822A, P433, RLC-823 Series (RLC-823A, RLC-823A 16X, RLC-823S1, P840, RLC-823S2, P850, RLC-823S1W), RLC-833A, P434, RLC-842A, RLC-843A, P437, RLC-422W, RLC-511W, RLC-511WA, RLC-523WA, RLC-542WA, RLC-843WA, W437, TrackMix Series and Argus Track (with zoom only available on the telescope/tracking lens)