Which do you guys prefer? I just used my extension tubes for the first time today and I'm not the happiest. I don't know why, but when I used extension tubes with my 35mm rig, it was much easier to find the sweet spot. I used them on my 200 and 75 in different stack ups. Now with the 120mm Macro lens can you focus all the way out to infinity and use it as a portrait lens also? Could somebody tell me what you think about that lens or the 135mm for the 67? I'm about ready to send this set of tubes back to KEH and exchange it for a macro lens.