What tripod do you work with? I have an oldie, a Tilt-All made of aluminum. It's very sturdy and stable but it's bulky. I'm thinking about switching to a Cullmann or a Benbo (Trekker). Anyone has had experiences with the two above? BTW, I shoot mostly med. format and I also like the flexibility of Benbo tripods (with the center column moving virtually anywhere you need.) Any ideas, replies will be read with interest and definitely considered! Thanks.