ultrafocuses

A theoretical amendment and interity on the method of ultrafocuses;

超焦距對焦法的理論修正和完善

This essay gives a detailed mathematical proof of the traits of the depth of the field and ultrafocuses,the factors affecting the depth of the field that is directly showed in other photographic articles.

對現有攝影文獻直接給出的景深及超焦距的特點和影響景深的因素作出了詳細的數學證明 ,進一步探討了這些結論在攝影技術中的實際意義 ,使得景深理論更為充實和完

The formulas of field depth and hyperfocal distance once appeared in bibilography, but the physical concept as starting point for inference of the formulas is not so clear that it is hard for the others to understand.

景深和超焦距公式曾在文獻中出現過，但推導公式出發點的物理意義不明確， 難以服人。

Precision measuring system of focus to aerial cameras with CCD;

航空相機焦距CCD精密測量系統

New focus measuring method of camera zoom lens;

一種攝像機變焦鏡頭焦距測量的新方法

This article introduces the theory and design methods of a zoom lens controller for zooming focus,focussing,and focus feedback in the incorporate zoom lens CCD camera based on 89C2051 microchip and MAX187 A/D switch.

本文介紹了可變焦一體化CCD攝像機中的一種基于89C2051單片機和MAX187 A/D轉換器的變焦鏡頭控制器進行變焦和聚焦控制,以及焦距反饋的原理及實現方法。

Having three focal lengths.

三焦距的有三個焦距的

equivalent focal length

當量焦距，等效焦距

Focus-to-film distance(f.f.d)

焦點-膠片距離(焦距)

autofocus zoom lens

自動聚焦變焦距鏡頭

long focus lens

長焦距（望遠）鏡頭

Focal length: The distance between the centre of a lens and its principal focus.

焦距:鏡頭中心與其主焦點的距離。

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快速變焦距手術顯微鏡

Only a bit out of focus.

只是焦距有點不對。

One must focus the camera before taking a picture.

拍照之前先要對焦距。

The image is out of focus.

這影像的焦距沒調好。

Don't forget to focus the lens.

別忘了調節鏡頭的焦距。

rear-controlled zoom lens

背面調整變焦距透鏡

best image plane of zoom lens

變焦距物鏡的最佳像面

image plane displacement of zoom lens

變焦距物鏡像面位移

manual zoom lens

(鏡頭)手控可變焦距透鏡

He focused the camera and took a photo.

他對好焦距，照了一張相。

Eyeglasses having trifocal lenses.

有三焦距鏡片的眼鏡

the ratio of the focal length to the diameter of a (camera) lens system.

相機鏡頭直徑焦距比。