shift and tilt are totally different things. While it does not matter whether you shift the negative carrier, the front or the back standards of your camera, tilting the camera front or back standards or the easel are three different things. The focal length of the enlarger lens does not matter. Enlarging is a simple projection of a two dimensional source on a two dimensional target and is totally independent of the focal length of the el-lens. El-lenses do have different focal lengths in order to archive different image circles without the need of distorting WA lens designs.