Proper method to retrieve camera position

I attempted to move the camera using mouse input using the following script but the camera shakes rapidly once moved. I assume that the method to retrieve camera position is incorrect. I have tried using math.Lerp as a workaround but the screen shaking still happens.

Code (CSharp):

1.  
2.         float3 inputPosition;
3.         float3 inputPositionPrev;
4.         protected override void OnUpdate()
5.         {
6.             InputSystem inputSystem = World.GetExistingSystem<InputSystem>();
7.             inputPosition = inputSystem.GetWorldInputPosition();
8.  
9.             if (inputSystem.GetMouseButtonDown(0))
10.             {
11.                 inputPositionPrev = inputPosition;
12.             }
13.             if (inputSystem.GetMouseButton(0))
14.             {
15.                 Entities.WithAll<Camera2D>().ForEach((Entity entity, ref Translation translation) =>
16.                 {
17.                     inputPosition = inputSystem.GetWorldInputPosition();
18.                     float3 newPos = translation.Value - (inputPosition - inputPositionPrev);
19.  
20.                     translation.Value = newPos; // BUG: will shake screen rapidly ):
21.  
22.                     // Store last input pos
23.                     inputPositionPrev = inputPosition;
24.                 });
25.             }
26.         }