I am aware that this question depends on the person behind the camera, but building a 3 lens kit has been on my mind. At the moment, I have two camera systems, Pentax K "K1000" and Canon EF "Elan II". I do have the M42 adapter for pentax and will be getting one soon for my canon. For both systems, I have 50mm, 1:2 pentax and 1:1.4 USM for my canon "Still the pride and joy of my lenses." I have a Rexagon Auto MC 28 2.8 on its way for the bay. There is very little info on it, but from what I have seen, it looks pretty good. For both systems, I have a typical zoom, 70-200 F4 for the k mount, 70-300 F4-5.6 Sigma DG APO for my cannon. What I am thinking about for my 3 lens kit would be 28,50, and something in the 135 to 200 range.The Bauer 500mm F8 has been on my mind for the sole purpose of rail photography. That would be an interesting walk around lens. Can you imagine peoples reactions? What are your thoughts on a 3 lens kit, and what odd lens would you keep on hand for special purposes?