1. The imaging scale of the lens should be consistent with the CCD target scale of the industrial endoscope camera. As mentioned above, there are 1 inch, 2 / 3 inch, 1 / 2 inch, 1 / 3 inch, 1 / 4 inch, 1 / 5 inch and other standards.

2、鏡頭的分辯率 描繪鏡頭成像質量的內在方針是鏡頭的光學傳遞函數與畸變，但對支持而言，需求了解的僅僅是鏡頭的空間分辯率，以每毫米能夠分辯的黑白條紋數為計量單位，計算公式為：鏡頭分辯率Ｎ＝１８０／畫幅格局的高度。因為工業內窺鏡攝像機ＣＣＤ靶面巨細已經標準化，如１／２英寸攝象機，其靶面為寬6.4mm＊高4.8mm，１／３英寸攝象機為寬4.8mm＊高3.6mm。因而對１／２英寸格局的ＣＣＤ靶面，鏡頭的分辯率應為３８對線／mm，對１／３英寸格局攝象機，鏡頭的分辯率應大于５０對線，攝像機的靶面越小，對鏡頭的分辯率越高。

2. The inherent principle of lens resolution to describe the imaging quality of lens is the optical transfer function and distortion of lens. However, for support, what we need to know is only the spatial resolution of lens. Taking the number of black and white stripes that can be resolved per millimeter as the measurement unit, the calculation formula is: lens resolution n = 180 / height of frame pattern. Because the size of CCD target surface of industrial endoscope camera has been standardized, for example, the target surface of 1 / 2-inch camera is 6.4mm wide and 4.8mm high, and that of 1 / 3-inch camera is 4.8mm wide and 3.6mm high. Therefore, for 1 / 2 INCH CCD target, the resolution of the lens should be 38 pairs of lines / mm. For 1 / 3 inch camera, the resolution of the lens should be more than 50 pairs of lines. The smaller the target of the camera, the higher the resolution of the lens.
               

3、鏡頭焦距與視界視點 依據工業內窺鏡攝象機到被監控方針的距離，挑選鏡頭的焦距，鏡頭焦距f確定后，則由攝象機靶面決定了視界。

3. Firstly, the focal length of the lens is selected according to the distance from the industrial endoscope camera to the monitored target. After the focal length f is determined, the visual field is determined by the target plane of the camera.

4、光圈或通光量 鏡頭的通光量以鏡頭的焦距和通光孔徑的比值來衡量，以Ｆ為標記，每個鏡頭上均標有其大的Ｆ值，通光量與Ｆ值的平方成反比關系，Ｆ值越小，則光圈越大。所以應依據被監控部分的光線改變程度來挑選用手動光圈還是用主動光圈鏡頭。

4. Aperture or luminous flux the luminous flux of a lens is measured by the ratio of the focal length of the lens to the luminous aperture. Marked by F, each lens is marked with its larger f value. The luminous flux is inversely proportional to the square of the F value. The smaller the F value is, the larger the aperture is. So we should choose the manual aperture or the active aperture lens according to the light change degree of the monitored part.