美军手枪教材上这样说的:
第一步,Sight alignment 准星与照门形成一条直线. 瞄准时,准星的上沿要和照门上沿齐平,准星要位于缺口的正中央(下图,左).
第二部,Sight placement 瞄准目标. 正确的瞄准方法是把第一步成直线的准星放在目标的重心位置(亦即是,用准星上半截压住命中点,见下图右). 由于人的眼睛不能同时看清不同距离上的物体,因此在击发前的一刹那,眼镜总是注视着准星. 当能看清准星时,照门和目标就会变得模糊. 只要目光注意准星,就可以保持正确的瞄准关系. 即使稍微偏离目标中心,但依然能命中目标. 因此,保持正确的直线关系,比刻意地对准目标更重要.
要使枪身完全不动是不可能的,它会随着身体有规律的摆动. 射手必须时刻保持准星和照门的直线关系,学会控制呼吸,把摆动限制在目标中心的周围,并适时的扣下扳机.
根据个人的经验:吸气时,枪口上扬; 呼气时,枪口下沉.要学会自如的控制呼吸循环.
有的照门是可以调节射程的,只要正确地装定读数,瞄准的要领还是一样的.
贴出原文给你参考:
2-2. AIMING
Aiming is sight alignment and sight placement (Figure 2-5).
a. Sight alignment is the centering of the front blade in the rear sight notch. The top of the front sight is level with the top of the rear sight and is in correct alignment with the eye. For correct sight alignment, the firer must center the front sight in the rear sight. He raises or lowers the top of the front sight so it is level with the top of the rear sight. Sight alignment is essential for accuracy because of the short sight radius of the pistol. For example, if a 1/10-inch error is made in aligning the front sight in the rear sight, the firer's bullet will miss the point of aim by about 15 inches at a range of 25 meters. The 1/10-inch error in sight alignment magnifies as the range increases—at 25 meters, it is magnified 150 times.
b. Sight placement is the positioning of the weapon's sights in relation to the target as seen by the firer when he aims the weapon (Figure 2-5). A correct sight picture consists of correct sight alignment with the front sight placed center mass of the target. The eye can focus on only one object at a time at different distances. Therefore, the last focus of the eye is always on the front sight. When the front sight is seen clearly, the rear sight and target will appear hazy. The firer can maintain correct sight alignment only through focusing on the front sight. His bullet will hit the target even if the sight picture is partly off center but still remains on the target. Therefore, sight alignment is more important than sight placement. Since it is impossible to hold the weapon completely still, the firer must apply trigger squeeze and maintain correct sight alignment while the weapon is moving in and around the center of the target. This natural movement of the weapon is referred to as wobble area. The firer must strive to control the limits of the wobble area through proper grip, breath control, trigger squeeze, and positioning.