I am wondering if anyone has had any experience with the bushnell doubler, or any binocular doubler for that matter? Its my understanding that using a doubler will decrease image quality but may be useful for those times I don't want to carry a spotting scope. Is there any reason a person couldn't use a doubler on each eyepiece at the same time? Will the bushnell doubler fit over the eyecups of a leica duovid binocular?