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Parallax adjustment with a side focus

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Traditionally, rifle scopes had a fixed parallax set at 100 meters or 100 yards; however, with the advance of shooting sports, such an approach was not adequate anymore. Scopes with fixed parallax offered the best resolution only at one distance (100 meters/yards) at which the target was in focus. At all other distances, the picture was less sharp or even blurry. An even bigger problem with this type of scope was the fact that, when shooting at the target, not at the same distance as the scope parallax setting, the shooter had to be very careful about his eye alignment with the optical axis. If the eye is moved away from the optical axis, the reticle on the target will move, which will worsen the accuracy. Since these errors are small, the fixed parallax option is still considered accurate enough for traditional hunting. For sport shooting, though, such small error leads to poor results. Parallax errors become more pronounced with magnifications higher than 12x, and that means the majority of scopes with magnification range under this value need no parallax adjustment.

With the ability of parallax adjustment, the accuracy of the riflescope is greatly enhanced at all distances. The shooter, however, has to adjust the parallax setting before making the first shot. Such scopes usually have AO – Adjustable Objective or SF – Side focus acronym in their name.

With SF – Side focus scopes, parallax is adjusted with a rotation of the turret on left side of the main tube. Such an approach offers easy adjustment of the parallax in the prone position and is the best solution for situations when parallax must be adjusted often. Due to this reason, such scopes are usually used on tactical scopes and similar, where parallax is adjusted before each shot and distances to the targets change rapidly. Scopes, which offer parallax adjustment with a side focus, are usually bigger and heavier than counterparts with parallax adjustment on Adjustable Objective. They are also more expensive to produce. Due to the size of the internal mechanism for side focus adjustment, the majority of such scopes have a tube diameter of 30mm or more.

The easiest way to correctly set the parallax is to look at the target and gently rotate the ring on the side focus. When the target is in focus and the image offers the best sharpness, move the eye from the optical axis to any direction. If the rifle is properly supported and fixed, the reticle should not move on the target when the eye is moved from the optical axis. If it does, parallax adjustment must be fine-tuned until the reticle is still, even if the eye of the shooter is moving around the optical axis.

Do not mind the meters or yards written on the adjustable objective, since they only provide an approximate value. There is nothing unusual if these values do not correspond well with the actual target distances.

Video presentation of Parallax adjustment on the objective bell

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VIDEO

A riflescope is an important piece of equipment when hunting in the mountains. Such hunts are strenuous – the hunter has to be in good physical condition. Hiking to the desired location and back to the starting point usually takes hours, not to mention that the shot game (if any) has to be carried when returning.

A riflescope is an important piece of equipment when hunting in the mountains

A riflescope is an important piece of equipment when hunting in the mountains

General features

It is important not to carry to much weight when going on a mountain hunt. For this reason, the riflescopes in this category are compact and lightweight. The objective lens measures 40–50 mm in diameter – a bigger lens is not required as mounting hunting is mostly done during the daytime.

It is important to have a high maximum magnification as the distance to the observed game can be quite substantial. A magnification of at least 10x is recommended. An adjustable parallax is a must when high magnification is set.

A BDC-turret comes in handy as the user can quickly compensate for the bullet drop at various distances (1 – 100 m, 2 – 200 m, 3 – 300 m, etc.)

To summarize, the features of a typical optics designed for mountain hunting are:

  • A light, compact chassis

  • 40–50mm objective lens

  • High maximum magnification (above 10x)

  • Adjustable parallax setting

  • Optionally available with a BDC turret

Use on mountain rifles

Since minimizing the weight is the key to a mountain hunt success, the primary piece of equipment is a lightweight rifle. Such rifles are often referred to as mountain rifles.

These firearms, designed for use in mountainous terrain, are compact and designed to withstand adverse weather conditions. Popular choices include repeating short-barrel rifles and single-shot drop barrel rifles such as Blaser K95 Stutzen and Merkel K3 Stutzen.

These lightweight rifles and riflescopes mentioned above are a great combination.

Long-range shooting

In the mountains, the distance to the observed game can be huge, especially in the open ground. For this reason, these riflescopes are equipped with a high maximum magnification power, allowing the user to carefully examine the game before taking the shot.

Furthermore, they feature an adjustable parallax turret for a clear focus at any range. A BDC turret works well in such situations as it allows quick compensation for the bullet drop at various distances. In the majority of cases, shooting in the mountains is done at distances up to 400 m.

Shooting at greater distances than this is rarely pulled off as it violates the principles of the ethical hunt.

Riflescopes for mountain hunting are designed for long-range shooting

Riflescopes for mountain hunting are designed for long-range shooting

Riflescopes for mountain hunting vs stalking

These two types of riflescopes appear identical at first sight as they are both compact and lightweight. There are, however, many differences between them. The most notable is the magnification range. Riflescopes designed for stalking have a much lower maximum magnification.

Consequently, they lack an adjustable parallax feature. Because of lower magnification, it is difficult to shoot accurately at a target far away. Riflescopes designed for stalking are scarcely offered with a BDC turret.

Riflescopes for mountain hunting aren't suitable for driven hunts because their minimum magnification is too big and field of view too narrow. Even though the magnification range of riflescopes designed for stalking doesn't begin at 1x, they can still be used in a driven hunt (the lowest magnification is often 1.5x, 2x or 3x).

Illumination

All the premium riflescopes for mountain hunting are equipped with an illuminated reticle, even though it is not an essential feature. Mountain hunting is done during the day, meaning that you won't have to use the illumination often but it might come in handy in certain situations. Having a thin reticle is far more important – you don't want to have too much coverage of the game when the magnification is set to high power.

It is important not to carry to much weight when going on a mountain hunt

It is important not to carry to much weight when going on a mountain hunt

Best riflescopes for hunting in the mountains

Optics manufacturers with headquarters near the mountainous areas tend to have the best understanding of the mountain hunters' requirements. If you are looking for top-of-the-line riflescopes for mountain hunting, Austrian (Swarovski, Kahles) and German riflescopes (Zeiss, Leica, etc.) won't let you down.

Leupold has an extensive offer of high-quality riflescopes suitable for this purpose, and Vortex is also highly competitive in this field with their LH riflescopes. 

short presentation of Riflescopes for Mountain Hunting is available here.

Short Presentation | Riflescopes for Mountain- Hunting | Optics Trade from Optics-Trade