Smarter camera movement - any pros around?

Hi, I am having a screen that has the double size of the height. I am having a camera that moves when the character in the game moves upward the screen. It works fine but I want to fine tune this camera movement, because when the player is on the top of the screen and is moving downwards - I can't see what below because the camera is to high up.

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        --Control camera movement       
        if(player.y<250) then
                        gameGroup.y =  ((ball.y * -1) +250)-5
                        ball.jumping = true
        end

the only thing i saw was to change this:

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gameGroup.y =  ((ball.y * -1) +250)-5
views:1628 update:2012/2/8 8:46:10
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