For 4x5, you can go for years with a 90 mm (possibly on a recessed board, or use a bag bellows), 135 or 150 mm, and 210 mm lens. A nice thing about Cambo is the interchangeability of the bellows. I started with a 45SF (short monorail), then found extension monorails, a bag bellows, and an extra-long bellows.