4X5 format 90, 135, and 210. It seems I go through a preference change on a daily basis, I think it is just the mood of the landscape I am in at the time. Do I want to grab it all, or isolate elements of the scene? I just got a 360 and wonder how often I will use that. Sometimes I wish I had a 1,200mm, but I am glad I'm not carrying a camera in the field that will accommodate it.