If a manual is not available, can anyone email. PDF of the specs, esp the close focusing distance, and how to adjust them /set up, using the diopter control & focus control. Can my pair be dated/ serial # 838xxx. When I purchased them in my 20's I had 20/20 and could see! Today, I use telescoped glasses at work, need 3+ diopter magnification to read, and distance has become foggy as well. can these binocs be adjusted for my vision?