Tube just above the height adjustment knob (Elevation Adjustment); on the left or the right to regulate or so (or call the wind side) of the knob (Windage Adjustment).
In fact, controls the cross line of control (that is, reticle Reticle) movement. However, the adjustment knob is the point of impact marked on the movement direction of the arrow.
In general, the level of controls direction of the arrow is point of impact (Impact) up, and controls the direction of the arrow is the point of impact to right direction. Individual is a double arrow, in addition to "UP", "R", it also includes "DW" and "L", representing the down and left, also said the point of impact is the movement direction. Do not memorize lines and knob cross between the forward or reverse, because the different design principles aimed at a different mirror.
Modern Sight lens optical system is transferred as the Kepler system, there are around two focal plane, so Kepler sight roughly divided into two categories: If the first focal plane reticle, that Divisional Board Installation is inverted; if in the back focal plane is being established. Like to use our forces before the focal plane, but if you buy the U.S. side, 99% of the focal plane of the latter. Front focal plane of the partition, in the changing magnification of the case, the thickness of sub-crossed with changes also with the goal of mirroring, it can be marked secret site for the location; then focal plane of the partition, cross line remains unchanged, changes in magnification of the case will be the original close relationship between changes in position, is not demarcated from the scale (except for fixed rate), but placed after the focal plane of the division of a more relaxed space, design and manufacturing are more convenient placement reticle lighting is also easier, but the overall structure more fluid, more beautiful.
Real gun before school started, it must first be conducted according to their vision diopter adjustment. Diopter adjustment is in fact adjusted to the reticle eyepiece spacing, so that through the eyepiece reticle formed as accurately projected onto the retina. As the degree is not correct, would be impossible to cross lines, using the naked eye if the regulatory function itself, will soon result in visual fatigue.
Present frame with rear diopter adjustment scale, business-type sight range of apparent degree of + / -2.5; recruitment examination will be excluded because of poor vision who, the army's sight diopter adjustment range is typically only 0 to 0.5. Scale corresponds to 0 in normal eyes, myopia of 100 degrees corresponds to -1. Hyperopia 200 degrees corresponds to +2, and so on. General sight glasses allow observation, it can be used as normal eyes.
Diopter adjustment approach is to select a target 50m away, or the side of the white walls, the eye through the eyepiece observation of relaxation, transfer programs can see a clear picture frame until the crosshairs. Testing approach is to relax with eyes closed, then opened his eyes, at first glance you can see a clear cross lines, no longer need to re-adjust.
Note also that scale units, if the label is cm, it is easy to understand a scale in the 100-meter mobile 1cm, 200 m mobile 2cm, and so on; If imitation Europe and the United States of sight, usually 1click ~ 1moa, 1 / 2moa, 1/4moa, several specifications that the amount of movement is a scale were 1 ', 0.5', 0.25 '(moa, point of the system unit, the unit read "sub", 1 ° = 60'). For example, 1moa at 100 yards (about 91.4 meters) in the amount of movement is 1 inch (2.54cm), 200 yards is 2 inches (5.08cm), and so on; and 1/2moa is 1moa half.
Cross lines in the upper left point of impact, you need to move the lower right corner: the level of the arrow controls the direction of rotation against the direction of the arrow controls along the direction of rotation, and then launch a group to observe the impact point and a second round of amendments, until an accurate hit. For military rifles, this job is typically a range of 100 meters, but also a calm environment in the completion. For pistols or air guns, the range can be reduced to 25 meters. This process is called "Sight in", country and some people called "school gun" the gun from the school called the "SID": Sight in distance, or known as the Zero-targeting zero.
Controls the level of a class known as the BDC: Bullet Drop Compensator (impact drop compensator), in fact, each 100 meters of the amendment is to point out that the value of distance, 1 corresponds to the 100m, 2 corresponding to 200m ... ... similar to the rear sight. China's military sniper guns fall into this category. BDC is convenient to use, but not with the climate, geography, type of ammunition is regulated is not perfect, so high precision sniper rifle sight is not very wide application. BDC zero, is carried out in the 100m, the distance scale corresponding to 1.
There is also a reset zero Zeroing steps. Inverse of the cross lines coincide with the point of impact after the next re-shooting can not rely on memory to determine the zero point of the scale. Release the button you can adjust the screw, so that controls scale Scale of 0 Index re-calibration along with pointers overlap. After only directly back to 0:00 on it.
Different from the target through the lens into the image, not necessarily in the crosshairs of the optical surface, this phenomenon is known as "parallax" Parallax. For example, the clock dial scale pointer and not a plane, we move our head, their relative relationship changed, which is called "disparity."
Parallax sight exists, target image with the cross line with the observed relationship will change until change detection method is to sight on the table, aiming at targets 100 meters away, through the eyepiece observation target, and kept swinging his head, if you find around the upper and lower cross goal lines are shaking, you have to pay attention, and your sight there is disparity.
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