Camera position for different screen apect ratio

Hi,
i have a problem with positioning the camera for my 2d iOS game.

I need to setup the camera, to crop the scene starting from the left bottom corner of my background sprite. (I need the camera left bottom corner to be the same point with left bottom corner of background sprite)

I have a background that is designed for the biggest screen - iPad. When i set the camera position and start game preview with iPad everything is ok, but when i change aspect ration for smaller screens, the camera is allway centered and cropping some space on the left, that is important to game action. (right space can be cropped).

Can i set the camera position fixed to left bottom corner of my background sprite?
Thanks.