Yes mine works fine with RSPB HD's. It screws into the front centre pivot of the binoculars, just need to remove the protective cap. Mine doesn't look like this picture - However it is similar.
By ken on 06 July 2014
The retaining screw designed to fit into binocular body did NOT fit. The thread was a different size. I'm still trying to work out how to sort the issue as the holes and threads are not easy to adapt. It's a shame as the item is otherwise of good quality
By COLIN J BENTLEY on 13 May 2015
I have a pair of "Carl Zeiss" 10x50 and the focus bar is 12 mm and the opticron fits well on them I leave the bracket on all the time as they dont impede putting the bins back in their case Hope this is of use,PS they are well made
By John Smart on 07 May 2015
I can't speak for the Helios brand, but my Practica 20x50 binoculars are fairly heavy and the Opticron mount handles them with no problems. There is no bending or flexing, so they should suit a wide variety of binoculars
By Paul Clubley on 03 March 2014