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This adjustment will ensure that your parallax correction is valid. This adjustment may vary from shooter to shooter, but as long as the current shooter has the reticle in focus, the parallax adjustment should remain constant.

Most modern rifle scopes have a parallax correction system that involves a dial on the side of the main tube, often referred to as a “side focus.” These systems allow a shooter to adjust the image of the target backward or forward to match the focal plane of the reticle. Many of these dial systems are marked with yardage in increments of 50 or 100 yards to aid in correction.

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A simple way to find the correct position of the dial is to set up a clear target that stands out well from the background, get your rifle in a secure rest position, and with the magnification at its highest level, look through the scope and begin to shift your head (and therefore your viewing angle) back and forth.

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Due to its broad transmission range (2.0 - 16 µm) and opacity in the visible portion of the spectrum, germanium is well suited for IR laser applications. As shown in the Graphs tab, this substrate also acts as a longpass filter for wavelengths greater than 2 µm. In addition, germanium is inert to air, water, alkalis, and acids (except nitric acid). Germanium's transmission properties are highly temperature sensitive; in fact, the absorption becomes so large the material is nearly opaque at 100 °C and completely non-transmissive at 200 °C.

When handling optics, one should always wear gloves. This is especially true when working with germanium, as dust from the material is hazardous. For your safety, please follow all proper precautions, including wearing gloves when handling this material and thoroughly washing your hands afterward.

Thorlabs offers Ø1/2" and Ø1" wedged germanium (Ge) windows that are uncoated or AR-coated for 7 - 12 µm. These wedged optics eliminate fringe patterns and can be used to help avoid cavity feedback. Windows are useful for protecting a laser output from environmental effects and for beam sampling applications.

When buying a rifle scope, be sure to consider the distances you plan to shoot and the ergonomics of its adjustment systems. The best way to familiarize yourself with a rifle scope is to physically hold one in your hands. The style of adjustment is not critical, but the adjustment itself will eliminate a lot of headaches when working to zero your rifle or make those critical shots.

If your reticle appears to move or shift with your head movement, you have a parallax issue. The yardage indicators on your parallax adjustment will be a helpful starting point for corrections. Depending on your range and magnification level, the correction may be extremely fine or up to a full revolution of the dial.

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Before attempting to adjust for parallax, ensure that your reticle is in focus. An easy way to do this is to look through your scope at a plain, ideally bright background that’s at least five yards away. Your scope likely has a reticle focus ring on the ocular lens – the one that you put your eye to. Adjust that ring as you would a binocular or camera focus until your reticle is sharp and clear to your eye.

The overall goal of parallax correction is to get your rifle scope reticle on the same focal plane as your target image. If these images are not in the same focal plane, either one can appear soft or out of focus when you look at the other through your scope. This causes eye strain and can lead to inaccurate shots or even target confusion for inexperienced shooters.

Adjust until your reticle is sharp against your target and appears to lock on to your aiming point. You should be able to view both the reticle and the target without shifting focus. If you have made an adjustment and still have some play, continue making very fine corrections until you can move your angle as far as possible while maintaining a full image through the scope. The same process applies to an objective lens ring-style system, but it is not as precise as the dial type with yardage indicators.

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Parallax correction is a feature available in nearly all modern rifle scopes. The effect of parallax is presented when your reticle appears out of focus with respect to your target, and to the focal plane of the scope. Although generally not an issue at ranges of less than 150 yards, this optical effect can greatly alter your point of impact at longer ranges.

When shooting at longer (>150 yards) distances, the focal length of your vision is adjusted by your brain to compensate for the distance to the target. This means that your reticle will appear slightly blurry or move when you adjust your viewing angle. It goes without saying, but if your reticle moves laterally and off-target when you move your head behind the scope, your point of impact will follow!

Light enters a rifle scope through the objective lens, is projected onto a prism, and is then flipped, reflected several times, and presented via the ocular lens. Your reticle typically lies between your eye and that projected image, regardless of the “focal plane” (FFP or SFP) of your scope.

Once you are satisfied with your adjustment at maximum magnification, LEAVE IT. You generally will not have to adjust it again unless the circumstances or shot range are extreme. These adjustments and changes are very slight, so keep that in mind when working to correct this issue.

Thorlabs' high-performance -E3 broadband AR coating has an average reflectance of less than 1.0% (per surface) across its specified wavelength range (denoted by the shaded blue area in the Coating graph below). The AR coating provides good performance for angles of incidence (AOI) between 0° and 30° (0.5 NA). The substrate transmission graph below shows the transmission of light through an uncoated Ge substrate. Please contact Tech Support to order optics with custom coatings or sizes.

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In addition to the germanium wedged windows offered here, Thorlabs also offers wedged windows with other substrate materials (see the selection guide above and to the right). Wedged Laser Windows with AR coatings centered around common lasing wavelengths and wedged Beam Samplers with broadband AR coatings on only one face are also available. Additionally, wedged windows with our standard AR coatings or custom sizes and thicknesses are available; please contact Tech Support for more information. We also supply planar windows with a variety of substrate materials and coating options. We also supply planar windows with a variety of substrate materials and coating options.