October 15, 2019 910 view(s)
What is a riflescope?An optical device that allows you to magnify your target. Riflescopes come in all sorts of styles, price points, construction, sizes and configurations. For example, the best rifle scopes for AR-10 would be different than the best AR-15 scope. And that’s why it’s important to understand how a scope works: so you can choose the best scope for your firearm. That said, the most important parts of a rifle scope are the lenses -- more specifically, the objective lens and ocular lens. Let’s break down each one, starting with…
Objective LensThe objective lens is the larger lens located at the front of the scope. Its purpose is to transmit light to the ocular lens. When the light passes through the objective lens, it’s sent to the erector lens which then flips the image and becomes magnified by the magnifying lens. When that happens, the light is then passed to the…
Ocular LensThe ocular lens is the smaller lens located at the rear of the scope. The function? To make a visible sight picture to the shooter. Both lenses -- objective and ocular -- can be coated with several different finishes. Lets quickly cover the different types of lens coatings.
Lens CoatingsThere are 4 different types of coatings:
- Coated: One layer of coating on one surface.
- Fully-Coated: One layer of coating on ALL glass surfaces.
- Multicoated: Multiple layers of coating on one surface.
- Fully-Multicoated: Multiple layers of coating on ALL glass surfaces.
ReticleA reticle is your crosshair. The reason for a reticle is so that the shooter knows exactly where to aim. There are a few different reticles like Duplex, Mildot, BDC, SPR and others -- all tailored to its own purpose. Let’s quickly explain the most important:
- Duplex: The simplest and fastest reticle. (Which could explain why it’s so popular).
- Mildot: Very similar to the duplex reticle, but differentiates by helping estimate the target’s distance.
- BDC: Also known as Bullet Drop Compensator, it helps adjust for bullet drop. (Mostly used by long-distance shots).
Fixed Power vs. Variable PowerA fixed power riflescope means that it works at only one power. For example: if the scope says “3x32mm”, that means it’s magnified at 3 times closer than the naked eye. On the other hand, a variable power riflescope means that you can adjust through various powers. For example: If the scope says “3-7x32mm”, that means you can adjust the magnification setting from 3x to 7x. Easy enough? Cool. But there’s a problem: when switching magnification settings, you might run into…
ParallaxParallax isn’t good at all. What happens is whenever you change the position of your eye, the crosshair will slightly change positions. This can negatively affect your shot and cause blurriness. Fortunately, there are a couple of ways to kill parallax:
- Factory-Set: Parallax adjustment is already built-in the scope.
- Adjustable Objective: A ring that corrects parallax.
- Third Turret: A turrets that remove parallax.