Have you ever found yourself sitting around the campfire, at the gun range, or out in the field confused about the conversation? Then you probably need to read this. This is scope verbiage for dummies.
I can certainly understand why someone would be lost when hearing acronyms like FOV, POI, and MOA. Even someone who has been around firearms and the outdoors their whole life can find themselves tongue-tied when these riflescope terms come up. I have simplified some of the most common terms any hunter, long-range shooter and firearm owner should recognize and comprehend.
Let’s start with what’s already been mentioned: FOV, POI and MOA.
Field of View (FOV)
The field of view is the observable area that a human can view through an optic device. For example, when you look through a scope, any kind of scope, the area that is confined to what you are actually observing through the end of that scope is your field of view or FOV. The FOV can be measured in degrees or linear field.
Point of Impact (POI)
The point of impact is where the bullet or laser hits the target. This is where the most impact will be had by pulling the trigger to fire or by aiming the laser downrange. This is especially useful for shotgun operators since a shotgun is designed to project a scattered pattern rather than a single shot. Your POI also shows a relationship between where you are aiming and where the bullet is going to hit. This can tell a rifle operator how far off their gun is from accurately being sighted in.
Minute of Angle (MOA)
You will hear this term most in long-range shooting. Minute of angle is often used to describe the size of the target. 1 MOA on a target that is 500 yards away is 5.” But let’s say the MOA on this target is actually 2. This means the target is 10″ in diameter. However, how much 1 MOA affects your POI, depends on the distance of the target. For example, there is a target sitting at 100 yards. An adjustment of 1 MOA on that target will move your POI 1.” This directly correlates in much higher distances as well. Let’s say there is a target at 1,000 yards. 1 MOA adjustment will now move this POI 10.” This helps shooters to more accurately hit their mark when shooting long-range because the bullet drops after firing due to factors such as wind, upwards or downwards angles, and gravity.
This is the lens at the end of the scope. Not the lens that you look through, but the lens on the other end of the optic. For example, anytime you see 1-9×30, this means that scope can magnify from 1 to 9 and the diameter of the objective lens is 30 millimeters.
A reticle is anything in the scope that helps you aim. In its simplest form, a crosshair is a reticle. A reticle can be etched onto the glass. This allows for the reticle to change in size as the scope magnifies (something also known as first focal plane) or to change color based on user preference. A reticle can also be fixed by being made from wire. You can tell whether a reticle is fixed or not by looking through the scope—if the crosshair is fixed at each edge of the scope, it is most likely not etched onto the glass lens.
This is the distance between the eyepiece of the scope and where the eye sees the full FOV with no dark edge around the image. If you are looking through a scope and there is a dark circle around the image, scoot your head closer to the sight. If you look through a scope and can’t see any dark edges, move your head back a little. Find that sweet spot where you can rest your cheek comfortably against the stock of the gun and see through the scope without any dark edges, but if you moved even a centimeter forwards, you would see a black circle distorting your FOV. If you take anything away from this article, I would suggest this be it. The repercussions of not allowing yourself enough eye relief can lead to something called “scope eye” or “scope bite.” This is when a shooter is too close to the end of a scope and the gun’s recoil causes the scope to hit the shooter and slices their eyebrow open and/or gives them a black eye.
Second Focal Plane
As mentioned earlier, the first focal plane is when the reticle gets bigger as the operator zooms in, and gets smaller as the operator zooms out. The reticle adjusts in size as the scope magnifies. A second focal plane is the opposite of this—the reticle is fixed in size no matter how magnified the scope can be.
I hope the understanding of these common terms help you get involved in the conversation and also helps you understand how your firearm can work better for you!
What riflescope or optics terms do you not fully understand? Leave your questions in the comment section and we will do our best to answer them!
Faith was born and raised in Ennis, Texas, a rural town just south of Dallas. Faith was a Marketing Intern with Sellmark Corporation and currently a senior at Baylor University, graduating soon with a degree in Marketing, with a focus on Data Analytics. Faith grew up hunting mostly deer, dove, and hog. Faith still spends her free time outdoors, as well as reading and coaching Crossfit.