为校正覆盖差，在40 x、60 x或20 x干系物镜上设计有覆盖差校正环(correction collar, CC)，校正范围一般在0.11--0.23 mm，长工作距离物镜可至2.0mm。
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Correction collar objective 带校正环物镜
Give to pressure is not a correction based skill but it could be confusing to a dog that had earlier been trained with collar corrections.
顺从压力不是纠正的基础技能，但是如果过早的使用项圈纠正进行训练会把狗搞糊涂。
Missing a mark is not like giving a prong collar correction at the wrong time.
弄错一次标记不像在错误的时间用带刺项圈纠正那样后果严重。
Give a soft dog a prong collar correction and the dog will shut down and quit trying.
使用带刺项圈纠正一头“软狗”会把它吓坏并停止尝试。
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