Shoulder mount with special re-designed, built-in 2 position trigger for auto-focus and shutter release. Complete unit weighs only 12 oz. Requires the use of specifically modified remote shutter releases for operation with your camera
This allows a super telephoto prime lens and DSLR to be held stable against the shoulder. It is very effective for wild-life photography where you are on the move.
I got this thru Amazon market place used. I knew what I was ordering however, the page said it was the model that had a trigger. When I got it it didn't have the trigger button. It was a different model. However, since it was used, and it still met my basic need, I kept it. That's what the low rating is about.