Big Glass questions. After reading, and reading, etc. I am leaning to the following equipment. I don't want to have to upgrade any more equipment to get something that works (currently have 4 tripolds for example). So, would appreciate any comments or recommendations. Thanks. The object is to get a longer glass; largest is now 80-400 VR. Appears the Sigma Telephoto 500mm f/4.5 EX DG APO HSM Autofocus Lens for Nikon AF is right for me. (Can't see myself pushing a wheelbarrow across the marshes carrying a 600mm lens.) Currently have PROMASTER ® SystemPro 2 Professional Tripod Their website doesn't give weight limit but I am guessing it might not be enough for a 500mm? Willing to try it however since I already have one. Question: appears it is best to have the tripod "platform" at eye level as opposed to having to raise the center post. My eye level is 66 inches. The tripod that will work (heavy enough) appears to be the GITZO G1548 MK2 MOUNTAINEER TELE-STUDEX TRIPOD WITH FLAT PLATE. However it isn't tall enough either to reach 66 inches (almost 59 inches with center post raised). How do you solve this problem? Not interested in spending hours leaning over anything. Appears I also need the Wimberley Head - Version II. The Sidekick is also popular but might not be enough. Appears I also "need" a telecoverter. Assume it is best to go with a Nikon one and start out with a 1.4? P.S. I really enjoy the pictures poster here. It certainly gives me something to shoot for. Frankly I wish I had had the time when I was much younger to get into photography.