SECOND FOCAL PLANE (SFP) MARCH RETICLES

Second Focal Plane reticles are maintained constant throughout the entire magnification range of the scope. Therefore the target image becomes larger yet the reticle line stays the same size. 

Different reticle widths are available. You can choose the reticle that suits your needs. A thin reticle works well for small aiming marks as the reticle width will be smaller than your aiming mark. Each reticle option will state the reticles width in the Specifications. 

Generally SFP reticles are thinner than first focal plane reticles. The thickness of the line and the dot does not change in size, nor does its appearance, as you increase the magnification of the SFP scope. 

Below is a formula to determine the amount of the target that the reticle line and dot thickness will cover for each power of magnification on any Second Focal Plane scope. You need to use the reticle dimensions given on the reticle diagram for your scope and note at which magnification the dimensions apply too. The dimensions given are only accurate at the magnification stated. For instance, for the MTR-5, the reticle diagram is at 10x  (10 magnification/power) as shown in the lower right hand corner of the reticle diagram from Deon's reticles webpage.

*** The reticle will appear like that on your target only when the magnification is set at 10X.

As you change the magnification of the scope the amount of the target that is covered by the line and the dot will also change.
To calculate the amount of the target that will be covered by the reticle line or dot at any magnification; use the reticle line size given in MOA and multiply it by the magnification given. Then divide that number by the magnification for which you desire to know how much of the target will be covered by the reticle line or the dot. That resultant will be the amount of area measured in MOA that the reticle line or dot will cover on the target. The MTR-5 reticle diagram is illustrated at 10x  (10 magnification). When set at 10 magnification the reticle line covers 0.2 MOA. At 100 yards (approximately .2 inches) and the dot covers 0.5 MOA at 100 yards (approximately .5 inches). The following calculation is to determine the MOA coverage of the line and dot at 60x:.2 x 10 = 2 divided by 60 = .03 MOA.Therefore at 60 magnification the reticle line covers aproximately .03 inches at 100 yards. As the target gets farther away it's image becomes smaller and the line then covers more of the target.Therefore at 60x at 1000 yds the reticle lines, horizontal and vertical will cover .03 MOA x 10 (One hundred yard intervals) = 0.3 MOA (approximately .3  inches) coverage of the 5 inch X ring on a F Open Class target at 1000 yds. The same theory applies to the amount of coverage of the Dot on a target at any magnification setting that you choose to set your scope.MTR-5: The Dot size given is 0.5 MOA x 10 magnification = 5. Five divided by 60 magnification = .083 MOA. Therefore when the magnification is set at 60 power; at 1000 yds the Dot will cover .083 x 10 = approximately .83 inches of the 5 inch X ring on a F Open Class target. It will actually be .8725 inches; as one MOA will actually cover 1.047 inches at 100 yds. The answer will be in MOA. At any magnification setting, the reticle will cover more of the target as the distance increases because the target gets smaller as the distance increases.MTR-5 example: The reticle line size given is .2 MOA x 10 magnification =  2.Two divided by 60 magnification = approximately .03 MOA.As you can see above the amount of the target that the reticle covers becomes smaller as you increase the magnification of the scope. It is easy to center an approximate one inch dot in the middle of a 5 inch aiming mark as it gives about 2 inches on each side of the dot too the edge of the 5 inch aiming mark/ X ring. The distance between the Dot and the edge of the aiming ring is about twice the width that the Dot covers. Makes for an easy comparison and centering. With the thinner MTR-2 reticle and dot; the Dot on the 5 inch aiming mark at 1000yds would cover less than half and inch (.43625”). The reticle thickness will also be half as thick at about .150 inches.A rough approximation is:.03 inches at 100yds.06 inches at 200yds.09 inches at 300 yds.12 inches at 400ydsand so on.At 25 magnification:.2 moa x 10 = 2 divided by 25 = .08 MOA.Coverage at 400yds:.08 x 4 = .32 inches