By adjusting your scope’s parallax, you bring your target into sharp focus and at the same time minimise ‘parallax error’. This, of course, could result in a miss that could be more pronounced at longer ranges. Why is this an important feature? Well, if the scope is slightly out of alignment, and so not in focus, you will find that if you move your head on the stock slightly to the left or right, it will appear to move the crosshairs off the target. It sets the lenses within the scope to be on the same plane. Parallax, as most will know, focuses the image in the scope, enabling you to see it clearly, but it also has another function. The other type has an adjustable parallax, which is found in most top-end scopes, particularly those designed for long-range shooting. The first type is usually a cheaper, more basic model that will have a fixed parallax, typically set around 100 yards or 150 yards. Parallax in a scope is quite complex but makes a big difference to the performance of a scope and your shooting.Ī: There are two types of scopes. Should you get a scope with parallax adjustment? If you always make sure your eye is dead centre (you have a perfectly symmetrical dark ring around the crosshairs) then parallax doesn’t matter. The figures on the ring may, or may not, be accurate and you won’t know without doing the above test at various known distances. Most ‘scopes are adjusted to be parallax free at about 100 yards (or metres) but some have parallax adjustment at the object glass (the end furthest from the eye). If the crosshairs move on the target when you move your head up and down or side to side, then you have parallax at the range of that particular target. To check if your rifle scope has parallax, fix the rifle in some sort of clamp. (Read our review of thermal imaging scopes.) Checking for parallax With high magnification scopes parallax error is particularly acute. It affects all scopes, but many have a parallax adjuster that focuses the scope at one range and aids accuracy. This is when the target image does not fall in the same optical plane as the reticle. However error in parallax can and does occur. In rifle shooting, the light transmitted through a telescopic sight will bend as it passes through the various lenses unless (a) they are perfectly ground and (b) your eye is dead centre in the optic lens. It’s why a fish or a stone under water will appear closer to you than it really is. What is parallax and how can it affect your rifle shooting? Parallax is caused by light bending as it passes from one medium to another. Want to buy a single issue of Shooting Times, Sporting Gun or Airgun Shooter?.Choosing the right bullets for deer stalking.British deer: A guide to identifying the six species found here and where to stalk them.Clay pigeon shooting tips and terminology.Country hotels offering shooting facilities.How to choose the right cartridge for your shotgun.How to choose the perfect airgun pellets for your rifle. Issues with eye dominance when shooting: how to deal with them.Shotgun certificate – how to get one and how to renew one.How to get a firearm certificate in the UK.Sign up to the Shooting Times newsletter.
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