I have two JVC camcorders that I mount on top of my scope. The first one stopped focusing past 50 yards when zoomed out. It works fine at closer ranges. In November I bought another of the same model so my battery and software would work. It focused fine untill last month and it started not focusing past 50 yards when zoomed past about 40X. Is this normal? I don't want to send them back to JVC for repair if I am doing something wrong. Any help out there in airgun world? Thanks, Scott