focal length就是焦距。平行光通过理想薄棱镜以后，会聚焦到一个点，这个点就是焦点。从棱镜到焦点的距...
focal length，即焦距。当平行光通过理想薄棱镜后聚焦至一点，该点即焦点。从棱镜至焦点的距离即为焦距。焦距一旦制作完成，便无法改变。现代棱镜组可实现调整焦距的效果。focus distance，焦点距离。理解这一概念需先了解理想薄棱镜的特性。当一物体反射的光线经由理想薄棱镜后在感光元件上形成的像遵循特定...
"Focus breathing" is the name often given to the change of focal length (and hence angle of view and magnification) when the focus distance of a lens is changed. I'm really not sure why it has become called "focus breathing", but that's the term that's often used for this ...
di 代表像距(distance of image); f=focal length,对于定焦镜头f是一个常数;对于变焦镜头f在一定范围内可调。 根据透镜的成像方程,无穷远处的物体(do=∞)像点位于焦点处(di=f)。 当物体向逐渐镜头靠近时,物距do逐渐变小,像距di逐渐变大,两者的关系始终满足成像方程。总的原则是,物距越大则像距越小,反之亦然...
Perhaps a different, tangential issue and I'm not sure if this applies to a refractor, but while I can achieve focus with my SCT with just about any given distance, the focal length reported during plate solving will vary depending on the back spacing. ...
Each line sensor has a number of light receiving elements, some of which are used as light receiving areas which are shifted in accordance with the detected current focal length of the main camera lens, the distance between the camera lens and the image forming lenses, the camera mode i.e....
same and just have the subject in focus at infinity in one case and at the minimum focusing distance (MFD) in the other. You will notice that there is a slight difference in the focal length (magnification) even though they were shot while keeping the focal length on the lens the same....
1) focal length;focal distance;focus 焦距<光> 2) optical focus 光学焦距 3) equivalent focal length 等效焦距<光> 4) back focal length 后焦截距<光> 5) front focal length 前焦截距<光> 6) Long focal length optical system 长焦距光学系统 ...
A point so related to a conic section and certain straight line called the directrix that the ratio of the distance between any point of the curve and the focus to the distance of the same point from the directrix is constant. Focus A central point; a point of concentration. Focus To bri...
A point so related to a conic section and certain straight line called the directrix that the ratio of the distance between any point of the curve and the focus to the distance of the same point from the directrix is constant. Focus A central point; a point of concentration. Focus To bri...