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| 41. | secondary focus |
| 次级焦点 |
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| 42. | pinpointed focus |
| 最佳焦点 |
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| 43. | institutional focus |
| 体制中心 |
|
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| 44. | principal focus |
| 主焦点 |
|
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| 45. | imaginary focus |
| 虚焦点 |
|
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| 46. | selective focus |
| 选择聚焦 |
|
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| 47. | focus electrode |
| 聚焦电极 |
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| 48. | aplanatic focus |
| 等光程焦点 |
|
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| 49. | Cassegrain focus |
| 卡塞格林焦点 |
|
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| 50. | variable focus objective |
| 可变焦物镜 |
|
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