Second Focal Plane reticle position

VIDEO

General features of Second focal plane scope

Riflescopes with a reticle placed in their second focal plane (SFP) are the predominant type of rifle scopes on the market. Second focal plane scopes have the reticle placed in the eyepiece, at the so-called second optical focal plane.

Such arrangement produces the effect that the reticle is seen the same size at all magnification settings. You can clearly see this effect in the picture below:

second focal plane and first focal plane reticle

First focal plane and second focal plane reticle position

Second focal Compare to the First focal plane

Second focal plane rifle scopes are especially popular since their reticles are thin on higher magnification and offer greater precision. Second focal plane reticles also have the advantage that, at low magnification, they are thicker compared to First focal plane reticles and easier to see. These two main benefits are the reason Second focal plane rifle scopes gained such popularity.

Reticle in second focal - plane

There are, however, also some drawbacks of rifle scopes with such optical construction. Reticle subtensions change with the change of magnification, and because of that, distance calculations with the reticle are only possible at one specific magnification setting. Similarly, it is possible to use holdovers for correction of bullet drop only at one specific magnification, which makes this technique very difficult to use. The last, but minor, a drawback is that low-quality riflescope can have a shift of the point of impact with the magnification change.

Video presentation of Second - focal plane scope

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VIDEO

Wide-angle riflescopes are built to offer the widest possible field of view for rapid target acquisition. Such scopes are used for close range shooting on driven hunts, while stalking, on dynamic shooting competitions or in close quarter tactical situations. Many of the wide-angle riflescopes also offer the option to use both eyes open when aiming and in this way have an unlimited field of view. Illuminated reticle gives further advantage to the shooter in fast target acquisition; however, such illumination has to be in bright daytime. Common features of wide-angle scopes are:

Magnification of 1.0x (or 1.1x as less ideal)
Field of view greater than 35m/100m
Illuminated reticle with daytime intensity
30 mm tube diameter (hunting models can be mounted with rails)
4, 5, 6, 8 or 10 zoom factor
Capped or tactical turrets
• Parallax fixed at 100m

Second Focal Plane reticle position

VIDEO

General features of Second focal plane scope