focus(ing) ring

• 对光环

英英释义

名词 focus:

1. the concentration of attention or energy on something

2. maximum clarity or distinctness of an image rendered by an optical system

3. maximum clarity or distinctness of an idea

4. a central point or locus of an infection in an organism

5. special emphasis attached to something

6. a point of convergence of light (or other radiation) or a point from which it diverges

7. a fixed reference point on the concave side of a conic section

动词 focus:

1. direct one's attention on something

2. cause to converge on or toward a central point

3. bring into focus or alignment; to converge or cause to converge; of ideas or emotions

4. become focussed or come into focus

5. put (an image) into focus