How to apply fast & slow camera transition.

EDIT: No, it's not gonna work. Just did some tests and, as I expected, the camera just stick to the player. The only way to flee away is to warp the player instantly, but it's pointless, because the camera will reach him again very fast.

EDIT AGAIN: I've changed Lerp to MoveTowards and now it seems to be working. The speed is going to be less than 0 when the camera stays too far beyond the maxDistance, so I used another if statement to get it back (closer to the player), otherwise it can't reach the player:

 float currentDistance;
 float minDistance = 1f;
 float maxDistance = 10f;
 float speed;
 
 currentDistance = Vector3.Distance (camera.position, player.position);
 speed = (maxDistance - currentDistance) / maxDistance;
 
 if (currentDistance > minDistance) // to keep the camera in distance from the player
 {
     // multiplier '1.5f' should be less then the player's speed,
     // otherwise he could never run away from the camera when it reach him
     camera.position = Vector3.MoveTowards (camera.position, 
         player.position, speed * 1.5f * Time.deltaTime);
  }
  if (currentDistance >= maxDistance) // to make camera chase the player if he'd ran too far
  {
      camera.position += (player.position - 
          camera.position) * 1f * Time.deltaTime;
      // or maybe it's better to use 'Lerp' here to get smooth movements
      camera.position = Vector3.Lerp (camera.position, player.position, 0.1f);
  }