Quote: As Pete says: practice, practice, practice. But I would add, practice most on the way you concentrate your vision.
Ron - Very good, I couldn't think of a way to put it, but you're describing the same thing I try to see when focusing. I just hit 55, had to start wearing glasses about 5 or 6 years ago, it definitely has an impact but I still get plenty good shots. My keeper average may be improving too, I'm not sure. Some days I can get loads of keepers, like the day I shot Pelicans all day and kept 140 shots, other days like yesterday I'm lucky to get 2. In fact I don't think I got but one yesterday and it was mediocre at best...