![]() However, if you commonly shoot beyond 300 yards, then your scope should truly have parallax adjustment to clear up your target focus. If shooting out to only 300 yards, you do not really need to be concerned about parallax. It occurs when the target does not fall on the same optical plane as the reticle.”Ī simple way to look at parallax is to call it your “target focus.” Scopes that do not have a parallax adjustment feature have a fixed parallax. To me a better description/definition is one found in the FTW Ranch’s Sportsman All-Weather, All-Terrain Marksmanship Training manual… “Parallax is the apparent movement of the target relative to the reticle when you move your eye away from the center point of the eye piece. The dictionary defines parallax as “the apparent displacement or the difference in apparent direction of an object as seen from two different points not on a straight line with the object.” What? Confusing? It is to me, too. Actually it’s been only in recent years that I started shooting long ranges and using scopes beyond 10x that I truly became aware of, and, found it necessary to learn about parallax. I did not learn about parallax until about 30 years ago. Back then I was never concerned about parallax. Just exactly what is parallax? Is this something I should be concerned about regarding the scopes on my hunting rifles? I’m currently using a 2.5-10x scope, but I am thinking about stepping up to a 3-18x.Ī: Like you, I have been hunting with a riflescope for a long time, albeit, longer than you mentioned, going back to a 4x Weaver and later during those early days a 3-9x Leupold. Today, many scopes have as special side knob for parallax adjustment. It’s interesting how hunting optics have changed since that time. If the scope has been correctly parallaxed, the crosshair will still be placed over exactly the same point on the target.Īn incorrectly parallaxed scope is one way to spoil your accuracy, and can lead to immense frustration if you think you’ve taken an otherwise good shot, but don’t realise you’ve failed to eliminate parallax error before squeezing the trigger.Q: I started hunting with a scope on my rifle about 40 years ago, initially a fixed 4x Weaver and then a 3-9x Redfield with duplex crosshairs. Lay the crosshairs over a target and move your shooting eye very slightly off the centreline of the scope. Once you’ve adjusted for parallax there’s a simple test you can do to determine whether any error is still present. ![]() Luckily, most modern scopes are equipped with a side-focusing turret or adjustment ring located on the objective bell, so you can adjust the focal plane of both these elements and eliminate parallax. ![]() If you look through a scope like this and your eyeline does not exactly match the centreline of the scope, you’ll get a similar effect to the passenger looking at the driver’s speedo. In terms of a telescopic sight, parallax error occurs when the target and reticle are not in the same focal plane. However, a front-seat passenger looking at the speedo would get a very different reading due to the angle at which they are viewing the needle. He can easily see theĬorrect speed at which the car is travelling. That sounds really complicated, so let’s take the example of the driver of a car who’s looking at the needle on the speedometer. The encyclopedia definition of parallax is a ‘displacement or difference in the apparent position of an object when viewed along two different lines of sight, and is measured by the angle of inclination between those two lines’. Parallax error isn’t just something that affects shooters, because it’s present in everyday life too. The parallax control doesn’t just eliminate parallax error, it makes the target look sharper and in focus – a real win-win situation
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