Novoflex's Chestpod is a great way to lend support when shooting with long lenses in scenarios where monopods and tripods would be impractical or prohibited.  It begins as a comfortable neckstrap, which articulates to a wide rubberized base that rests on your chest, usually just below your sternum.  Attached to this base is an arm that ends with a swiveling plate which has a 1/4"-20 screw for attaching the tripod collar of the lens.  Of course, with medium "fast" telephoto lenses such as an 85mm f/1.2 or f/1.4, 135mm f/2.0 or the like, you would attach the front of the Chestpod to the bottom of the camera.

In this way, the shooter achieves a stable triangle of vibration-reducing assistance for those longer teles.  Great for capturing sharp shots of scenes (such as popular tourist destinations) whose controllers have implemented anti-tripod rules in an attempt to sell their pictures.

The Chestpod can be used upon its own, or in conjunction with a quick release adapter to speed up the attachment and detachment of the Chestpod and whatever you're attaching to it.

Adjustable angle between arm and camera attachment point

Adjustable arm length

Broad, stiffly-padded chest base ideal for handheld support