The problem with parallax comes in when you don’t have a direct line of sight to your target. In this illustration, you can see that the focal plane for the target image and the reticle are the same, so you don’t have to adjust the parallax. When the angle at which you are viewing the image through the scope changes, so will the reticle position relative to the target image. You can see that it is in front of the reticle, which means you have a parallax problem. In the illustration above, the point where the focal lines cross and form an X is the focal plane for the target image. Instead, it moves the planes at which these two objects are in focus so that they are the same (so they’re coincident.) You can tell that you have a parallax problem if you shift your gaze slightly and the reticle appears to change position. It is very important that you understand that correcting for parallax does not change the focus of the reticle or the focus of the image. If they’re not focused to the same plane, you have a parallax problem, an optical illusion that has to be corrected or you won’t be able to shoot accurately. Two things get focused in your scope: the reticle and the image itself. Parallax is a situation where the focal plane in your scope is offset from the reticle. Let’s explore more on what this term means and how to figure out if it’s a problem for you. Although it requires some initial working out, reticles like MTC’s SCB2 and AMD can provide a very practical method of quickly estimating (or checking) range while taking aim.It’s a common term used when describing scopes, but how well do you understand what parallax is? Even more important, is it something you should worry about? The answer to the second question is a definitive yes, if you’re a long-range hunter or shooter. And many shooters also like to use SFP reticles for ‘bracketing’, where ranges can be estimated after having predetermined what distance the gaps between reference points equate to at each of the scope’s magnification settings. This begs the question: “Why choose a SFP vari-mag scope, then?” Well, a zoom magnification feature is still a very handy feature to have, perhaps for spotting purposes where higher powers allow you to seek out a clearer sight picture. It is therefore best practice to familiarise yourself with the aim-point/trajectory relationship by only shooting on a specific magnification, like 8x. Of course, the centre point of the crosshair should not, in theory, deviate when the magnification ring is rotated, although it often does on the cheaper scope models! However, if you use multi-stadia crosshairs like the MTC SCB2 to allow for ‘holdover’ or ‘holdunder’, then you must be aware of this target/crosshair relationship change. MTC Optics’ FFP scope offering is the Cobra F1 model.īoth SFP and FFP scopes have their merits, so to help you make an educated decision when choosing your next optic, here’s a guide on each type. The majority of riflescope designs feature a second focal plane reticle as they’re easier to produce and keep costs down, but most quality scope manufacturers now offer FFP scopes in their range. Obviously, reticle design is also an important consideration when deciding on a telly, but perhaps less obvious is the focal plane in which the crosshair sits within the scope’s optical layout.Ī riflescope’s crosshair can either be situated in the first focal plane (FFP) or second focal plane (SFP) – and as each offer significant differences on variable magnification (or zoom) scopes, it’s important to determine which type is best suited to your style of shooting. When it comes to selecting a riflescope, shooters have a bewildering choice to satisfy their every need: fixed or variable magnification, sidewheel or objective parallax adjustment, 25mm or 30mm tube… and so on.
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