Fixing mouse drag movement

Questions & Answers
1

I have a 2d image that I move when with mouseDrag(). For some reason the object that I am moving with mouseDrag() moves faster then the mouse. I have added a buffer to slow this affect down, and I have noticed that the buff needs to be changed depending on my screen size, but I am at a loss on how to determine the correct amount for the object to move as the mouse moves. Here is what I am working with so far.

enter code here

void OnMouseDrag()
{
    selected = false;
    MoveBoard();
}

public void MoveBoard()
{
    // figure out the amount to move the game board
    // distance the mouse moved
    Vector3 amountToMove = Input.mousePosition - previousMousePosition; 

    // convert the mouse y cord to z cord
    float temp = amountToMove.y;
    amountToMove = new Vector3(amountToMove.x*xBuffer , 0, temp*yBuffer);

    //move the board
    transform.position += amountToMove;

    // set this position as the mouse last position 
    previousMousePosition = Input.mousePosition;
}
2

Turns out moving the board is a bad idea, and moving the camera is WAY simpler. 

enter code here

void OnMouseDrag() { selected = false; camera.WorldToScreenPoint(Input.mousePosition); }