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There are no evident energy gain when the focal spot size is too big or small.

电子的能量增益有一个最佳焦斑大小.

Secondary inflammatory changes included abundant collections of histiocytes and focal prominent type II pneumocyte hyperplasia.

其次的炎症改变包括大量组织细胞的聚集和II型肺泡细胞明显增生.

Accurate diagnosis is important because focal disease can be cured by surgically removing the focal lesions.

精确性诊断很重要因为局部病症可以通过外科手术切除病灶来治疗.

The focal length differs with the thickness of the lens.

焦距长底随透镜的厚度而变化.

And even among lenses of equal focal length and aperture, there are differences.

甚至即使是同样焦长度和光圈的镜头仍有不同.

The focal length of a given lens is different for different colors.

一个特定的透镜的焦距因颜色的不同而不同.

The unsteadiness of air becomes prohibitive only if instruments with large focal length are used.

只有在使用长焦距的仪器时,才不允许空气的不稳定.

C: Can I control the focal length?

我能控制焦距 吗 ?

The scanner's baseline correction including focal length adjustment and brightness, contrast white balance, color, tuning, etc.

扫描仪的基准订侧包含焦距调度和平度 、 差比度、不暗不均 、 颜色调校等.

You can set focal length for Lens distortion compensation.

您可以为镜头失真补偿焦距.

At present, some difficulties are encountered in measurement of long focal length of lens.

目前, 透镜长焦距的有效测量还存在一些难题.

When evaluating the focal length, all the images are turned upside down.

当评估焦距的时候, 所有的图像颠倒被转.

Focal length is the distance between optical centre and principal focus.

焦距就是镜片中心和焦点之间的距离.

Figure 4. Relationship Between Focal Length, FOV, Sensor Size, and Working Distance.

图4. 焦距, 视野FOV, 感应器大小, 和工作距离间之关系.

A typical lens has a focal length ( f ) of 625 mm.

常见镜头的焦距 ( f ) 为625毫米.

Determine the focal length of your lens.

决定你镜头的焦距.

This photogragh is shot by lens with a long focal length.

这张照片是用长镜头拍摄的.

After many experiments on the scanner's focal length error which makes up his mind.

众次测验考试后,差扫描仪的焦距差错也不离心洋有数了.

The focal length of the camera lens plays an important role in photo criteria.

摄影机镜头的焦距在摄影规范中起着重要的作用.

This dissertation at meeting the needs of designing long focal length space camera.

本文主要研究了长焦距三反射式望远物镜的设计.