UNDERSTANDING PARALLAX
Knowledge for the Hunting Exam
Parallax is a central topic in optics – and a classic part of the hunting exam. Those who understand what parallax is, how it occurs, and why it matters for aiming, can score confidently – both in theory and in firearms handling.
What is parallax?
Sample question: What is meant by parallax in a rifle scope?
Note: Parallax = apparent shift of the reticle when looking into the scope at an angle.
Explanation:
If the eye is not positioned exactly behind the rifle scope – that is, not on the optical axis – the reticle appears shifted in the image. As a result, the point of aim appears to wander, even though the scope has not been moved. This optical illusion is called parallax.
What is parallax error – and why is it critical?
Sample question: What effect can a parallax error have on the point of impact?
Note: Parallax error = deviation between actual point of impact and apparent point of aim due to angled view.
Explanation:
A parallax error occurs when the reticle and target image are not in the same image plane. Especially at long distances or with high magnification, this can cause the shot to deviate from the intended target – even though the reticle was placed exactly on the game.
Why does parallax occur at all?
Sample question: Why does a parallax error occur even if the rifle scope is correctly mounted?
Note: Parallax is caused by the displacement between the line of sight and the optical axis.
Explanation:
The cause lies in the positioning of the eye: If it is not centered behind the eyepiece, i.e., not on the straight line between reticle and target – off the optical axis – a perceived offset occurs between reticle and target. This effect can only be corrected through proper aiming or technical compensation.
What does “parallax-free” mean?
Sample question: Is a rifle scope parallax-free at every distance?
Note: Every rifle scope is parallax-free only at a specific distance – usually 100 m.
Explanation:
Many rifle scopes are factory-set to be parallax-free at a certain distance – typically 100 meters. Within this range, the reticle and target image lie in the same plane, so no parallax error can occur. At shorter or much longer distances, technical compensation is necessary.
How does parallax adjustment work?
Sample question: Which components of a rifle scope allow parallax adjustment?
Note: Parallax adjustment is done via an adjustment ring – on the side or front of the objective lens.
Explanation: Modern rifle scopes – such as those offered by MINOX – feature a parallax adjustment. The hunter can manually set the target distance – either via a side turret (Side Focus) or a rotatable objective (AO = Adjustable Objective). By precisely setting the distance, the target image is moved into the reticle plane – for a sharp, aligned image and a stable point of impact, regardless of viewing angle.
How do you check whether parallax adjustment is correctly set?
Sample question: How do you detect if parallax is still present?
Note: If the reticle moves when the eye shifts slightly, a parallax error is still present.
Explanation:
A simple practical test: Move the head slightly sideways or up/down without shifting the rifle.➞ If the reticle remains exactly on the target, parallax is properly compensated.
➞ If the reticle appears to move, the setting needs to be corrected.
Notes for hunting practice and exam
• Always look straight and steady through the scope – centered on the optical axis
• Use parallax adjustment if available: estimate or measure the distance and set it precisely
• For distances over 100 m and with high magnification, parallax adjustment is crucial for precision
Still have questions about parallax?
At MINOX, we understand how important a solid grasp of optical principles is – especially for aspiring hunters.
If you still have questions or something isn’t clear:
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We’re happy to help – with real practical knowledge and clear answers.
Best of luck in your hunting exam!
