Illuminated reticle

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Reticle illumination is getting more common in modern rifle scopes. There are, however, two groups of illuminated reticles, meant for two different uses. In both cases, illumination of the reticle substantially increases effectiveness of such rifle scopes. Reticle illumination systems are divided to:

Twilight illuminated reticles
Daytime illuminated reticles

Twilight illumination is used for better reticle recognition in low light situations, when non-illuminated reticle would be hard to see. Such illumination systems must offer fine adjustable intensity, since over illumination of the reticle will cause problems seeing the target behind it. This is especially important when hunting in low light, where fine-tuning of illumination intensity level is one of the main parameters on which rifle scopes are judged. Preferably, such rifle scopes have only the central dot in the reticle illuminated. Some have their entire range of intensity adjustment so dim that illumination cannot be seen during the daytime.

Daytime illumination of reticle serves a different purpose than twilight illumination, and in such rifle scopes, high intensity levels are a necessity. In such rifle scopes, the illumination of the reticle is meant for rapid target acquisition, since a bright red dot is the best possible aiming point. Shooters’ eyes are instinctively drawn to a bright red dot in the center of the field of view. Such strong illumination is feasible only in rifle scopes with magnification lower than 1.5x or ideally 1.0x. Such wide-angle rifle scopes with a real 1.0x magnification and daytime bright illumination of the reticle can even be used with both eyes open, similar to reflex/red dot sights.

Since almost all illuminated reticles are battery powered, an automatic switch off is a usable feature that can significantly prolong battery life and operation time of such systems. Most advance reticle illumination systems even include a motion sensor that turns off the illumination (and saves battery life), when the scope is in non-shooting position (90 degrees sideways or in vertical position).

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As the name suggests, prism scopes (sometimes also referred to as prismatic scopes) are composed of glass prisms – like binoculars. As a result, they are a much more compact optic. These compact, robust devices work similarly as red dot sights but are usually equipped with an illuminated reticle in the shape of a dot or a cross, surrounded by a circle. BDC reticles for .223 are common in prismatic scopes.

The magnification for these products is lower, and fixed: 1x, 2.5x, 3x, 4x, or 6x. Nearly every prism scope has a Picatinny mount built-in on the bottom part of the housing.

Prism scopes give the user an option of choosing between green and red illumination. All in all, these scopes are a great choice as they give the user a brighter and extremely sharp image, providing quicker target acquisition times.

General properties of Prism scopes

a compact, robust scope
prisms in the interior of the scope
illuminated reticle
fixed magnification (1x, 2.5x, 3x, 4x or 6x)
scope with diopter adjustment

Prism Scopes

Steiner and Burris Prism scopes

Why are prism scopes better for astigmatism?

Prism scopes are a great substitution for red dot sights for people with astigmatism because they have a dioptre that can be adjusted for personal differences in vision. If a user with astigmatism uses a red dot, they cannot see a clear image of the reticle, the dot may glow or appear dispersed into a different shape.

This is where prism scopes come to the rescue, as you can adjust the dioptre setting so that your eye can see a crisp reticle because there is no distortion.

Also, people who wear glasses do not have to deal with the obtrusive reflection of the dot. This is a great fix, the only downsides are a smaller eye-box and the lack of unlimited eye relief.

Prism Scope

Steiner S332 3x Prism Scope

What is the difference between prism scopes and red dots?

The most significant difference between Prism scope and the Red dot is that red dot sights feature 1x magnification, while prism scopes can have various magnification powers: 1x, 2x, 3x, 4x, or 6x.
Prism scopes are lightweight and small, yet still bigger than red dots. They have reticles in a shape of a dot or a cross, surrounded by a circle, which is different from reticles in red dots, which have, as the name suggests, only a dot in the center.
The latter are unusable without battery-powered illumination, while prism scopes (with an etched reticle) work without batteries.
Prism scopes also oftentimes allow the user to switch between a red or green illumination, while red dots usually do not offer the same option (it is mostly only red).

Overall, red dot sights are used for close distances, while prism scopes for close to medium distances. But if you ever find yourself using a prism scope with 1x magnification, keep in mind that it can also be used as an alternative to a red dot.

Burris prism scope

Burris RT-3X Prismatic

Illuminated reticle

VIDEO

Video presentation of Illuminated reticle

Bering Optics Supra 3x32 Prism Scope

VIDEO

General properties of Prism scopes

Why are prism scopes better for astigmatism?

What is the difference between prism scopes and red dots?

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Illuminated reticle

VIDEO

Video presentation of Illuminated reticle

Bering Optics Supra 3x32 Prism Scope

VIDEO

General properties of Prism scopes

Why are prism scopes better for astigmatism?

What is the difference between prism scopes and red dots?

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