At any given time I'm likely to be shooting loaner rifles, and so I keep eight or so scopes on hand to mount on these guns. Some of the scopes have been around for 15 years or more, and I keep using them because they work. The other day, however, I was shooting with one that had been around a long time, and on the other rifle I was using I had a brand-new Meopta MeoStar. When I switched from the rifle with the Meopta to the one with the old scope it was as though I had suddenly developed glaucoma. Everything went dim and muddy.