I've recently seen a couple of photographers with super telephotos using a RRS long lens support rail device. When questioned about it, they each said that it added a significant measure of stability to the lens since the lens is supported both at the mounting foot as well as a small roller at the front of the lens. Both lenses were mounted on this rail which was again mounted to a large ball head.
Do any of you have experience with one of these? Is it worthwhile or just another way for manufacturers to relieve us of our hard-earned cash?
Thanks...







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