I was at the range this weekend past weekend when I let a guy use my Zeiss Conquest 12X45 Binoculars. I mentioned to him that the binoculars where personalized to me so they might be a little blurry in one eye. When I said that he gave me a funny look and said how can they be personalized to your eyes. I then explained to him how to use the diopter on the binocular. He had no clue personalizing them to your eyes could be done. I guess it amazes me that people have the equipment but do not know how to use the stuff to the fullest potential.
Using the diopter, most of you may already know how this is done. Most binoculars will have the right eye as adjustable. Some will have the adjuster right on the rubber; some will be in line between the two tubes. Once you have found the adjuster, you can now adjust the binocular to your eyes. Find an object about 100yards away. Either close your right eye or cover the end of the binocular on the right side. Adjust the focus on the object of choice for your left eye. Once you are good and focused close your left eye or cover the left side of the binocular. This time when focusing on the same object you will adjust the diopter to focus your right eye, instead of the main focus adjuster. Once you have your right eye piece adjusted and focused on the same object as your left eye your binoculars are now adjusted to your eyes. From here on out you will only adjust the main focus knob. Now most diopters can be adjusted +/- 3.0 dpt. This is not that much but might be enough to make a big difference.