It is possible to have no parallax even if the objective and the reticle are out of focus and appear fuzzy. Notice that we don’t say that they are both in focus. This is because they are both in the same optical plane. When you move your head now you will see that neither thumb move in relation to the other. Now try putting your thumbs side by side. The distance between the thumbs represents two optical planes. The front thumb represents the objective and the thumb closest you represents the reticle. If you move your head from left to right you will notice that the thumb closest to you appears to move across the image of the front thumb. Now, you should have your thumbs lined up in front of your eyes about a foot apart. Place one thumb at arms length and the other thumb right behind it about half way to your eye. Try holding both of your thumbs out in front of you. The trick to parallax is focusing the reticle, which is about six inches from the shooters eye, and the objective (target), which is maybe 100 yards away. Quite simply, parallax is the situation that occurs when the reticle and the image are not in the same optical plane, causing the image to be unclear or to move in relation to the reticle. Many people are confused as to just what this term means. How often have you heard people talk about parallax? Do you know what it means? Can you explain it to other shooters? If you can't, you're not alone. Often, people will pick up and use technical terms without really understanding their meaning. “I focus the adjustable objective or side focus dial on my scope until I have a clear image of the objective, but I still see parallax when I move my head.?”
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