![]() ![]() (notwithstanding height over bore, ballistic drop or wind, of course you still have to do your part). So long as your eye is perfectly aligned with your target and your red dot sight, it doesn’t matter what the focus distance of the red dot is nor the distance of the target the dot will appear on the target exactly how it is zeroed. Even though the two rails are parallel, our visual perception is that they get closer together and then finally converge into a single line. Imagine you’re looking down a straight length of train tracks. Now we know infinity to mean limitless or endless but optically it means that the dot appears to be projected at a very long distance called the vanishing point. Many manufacturers claim that their dots are focused at infinity. Since you can see through the glass, the dot appears to hover on top of your target. That isn’t good and can mean missed shots.Īlthough the dot you’re seeing is just a reflection off of the front of your sight (or projected onto a lens in the case of an EOtech), it’s actually focused at a much further distance. This is all fine and good, but what it means to a shooter is that under certain conditions the dot will appear to be someplace it isn’t. When you’re driving down a road, the fence posts will rip right by while a house or hills in the distance seem to meander alongside. Driving in the countryside provides ample examples. More practical to your everyday life, the depth perception you gain from having two eyes and binocular vision comes from parallax.Īnother effect of parallax is that farther-away objects appear to move slower than they actually are. Before the days of GPS and laser range finders, naval vessels could use parallax to determine distances to targets. Astronomers use parallax to determine the distances of celestial bodies by noting the changes in perceived positions of far-off objects when the Earth is on opposite sides of the sun. Merriam-Webster 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“. As an aside, one of the reasons you’ll never see a holographic sight with the same battery life as LED reflected red dot sights is because it takes significantly more power to run a laser than a simple LED. ![]() This grating projects the hologram into the window and you see that trademark 65 MOA circle with a 1MOA center dot. From there it hits a collimating mirror to align the beam and it’s then directed to a holographic grating. Inside an EOtech is a diode that shoots a laser onto a folding mirror. It’s a bit of a different story with the EOtech and other holographic sights. The dot that you see when you turn on an RDS is that reflected light. This lens has been specially treated to reflect red (or sometimes green–thanks China) light back towards the shooter but allow other wavelengths to pass through. This emitter shoots a beam of light at a glass or polymer lens. Inside your simple RDS is an LED emitter. Some have multiple lenses, others use different coatings etc., but the following applies to virtually all that you’ll come across. Bear in mind that this explanation will be very general and every manufacturer has their own nuances. Before we go any further we should probably talk about the basics of exactly how a red dot sight works.īy a very large margin, the most common type of red dot is a reflector type. Today we’ll look into some of those claims, as well as define some terms. To be sure, the words “parallax free” have been penned in many a red dot sight (RDS) manual and repeated by just as many product representatives across the board. Why can’t they make it parallax free like everyone else?” “I really want an MRO, but Trijicon says it has some parallax. Scroll to the bottom for the video if you want to skip the boring stuff.Īs with many things we write about here, it all stemmed from a Facebook post. Today we’re bringing you through parallax and company claims of “parallax free” with explanations and actual testing. ![]()
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