Does this model of binocular have a bonded prism and if so is it not likely that that adhesive has failed? A few years ago I paid an "expert" to refurbish a pair of Barr & Stroud 7x50 Naval binoculars for me but I regretted it because they came back with one side showing spotted vision. When I complained about this I was told that special jigs were required to re-glue the prism which were no longer available and so I would have to accept it as it is.