If you use long lenses and you're looking for one of those win-win situations, you might want to consider the Lens Cradle Mount from DeluxGear. This lightweight, durable arc-shaped device attaches to any lens with a tripod collar and reduces stress on your neck and shoulders by supporting the camera and lens, keeping the lens horizontal rather than hanging down vertically. You can also quickly remove and invert the cradle mount, turning it into a bipod camera support that you can use on any handy surface for stable support while shooting.
The Lens Cradle Mount is designed for use with the DeluxGear Neo Duet Camera Strap, but you may also supply your own strap. The Lens Cradle Mount is made of a 60% polycarbonate, 40% ABS blend, for durability. A 1" rosette thumb screw provides quick and easy mounting to, and removal from, a tripod or monopod. The Lens Cradle Mount fits Canon, Nikon, Pentax, Minolta, Olympus, Sigma, Tamron, and Tokina lenses. Camera strap is not included.