In cinematography, diopter is technically a misnomer for a close-up adapter.

- 在摄中，“屈光度”实际上是对近摄接圈的一个技术性误称。

The split diopter was popularized by groundbreaking cinematographer Gregg Toland.

分光双焦点镜头的普及归于开创性的摄师格雷格·托兰德。

The diopters seam also more clearly separates the subjects, heightening the sense of eavesdropping.

分光镜的接缝更清晰地将主体分隔开来，增强了偷听的感。

The use of split diopters began to spread.

分隔 diopters 的使用开始流行。

But first, let's look at how to use a split diopter.

首先，我来看看如何使用分光镜。

The device also has a diopter adjustment built in, so people who wear glasses or contact can use it without wearing additional vision correction.

该设备还内置了屈光度能，因此佩戴眼镜或接触的人无需佩戴额外的视力矫正即可使用它。

Before a camera operator sets up the split diopter, they'll typically want to see how a scene is blocked.

在摄像师安装分光镜之前，他通常会先观察场景的布局情况。

Diopter strengths are like most lenses measured in meters.

- 屈光度强度与大多数透镜一样，以米为单位进行测量。

With a plus one diopter objects, one meter away will be in focus.

使用正一屈光度的透镜，一米远的物体将处于焦点上。

So it's very important to have a kind of stable stand for it, and that they just borrowed from standard diopters, standard implements.

所以有一个稳定的底座非常重要，他只是借用了标准屈光度和标准工具。

While a one-half diopter will allow objects two meters away to be in focus.

而使用半屈光度（one-half diopter）的透镜，则能让两米远的物体保持清晰对焦。

In 'Million Dollar Baby', this split diopter shot emphasizes the character's relationship.

在《百万美元宝贝》中，这种分隔镜头强了角色之间的关系。

There's also an uncannyness that is inherent to split diopter shots.

- 分割 diopter 拍摄固有的有一种诡异感。

A split diopter then refers to when this closeup adapter only covers a portion of a lens, allowing it to have two separate planes of focus.

分视棱镜指的是当这种近摄适配器仅覆盖镜头的一部分时，使得镜头可以有两个独立的焦平面。

As filmmakers have experimented with split diopter, variations on the shot have arisen.

随着制作人对分裂 diopter 进行实验，这种镜头的变化形式也随之出现。

This will give them a sense of how strong the diopter will need to be, - But only one of you poison the coffee.

这将让他对所需分光镜的强度有所了解，——但只有你中的一个在咖啡里下了毒。

But on the 1940 film, 'The Long Voyage Home', Toland used a different technique to achieve a similar effect using a split diopter to achieve this shot.

然而在1940年的《漫长的航程》中，托兰德采用了不同的技术， 通过使用分光镜来达到类似的效果， 从而实现了这一镜头。

The image of split diopter achieves varies based on the lens focal strength.

- 分光镜效果的图像会因镜头焦距强度的不同而变化。

But a split diopter gives a cinematographer more control over where the attention is directed on screen.

但使用分光镜能让摄师更精准地掌控观众的视线在屏幕上的落点。

Sometimes the split diopter can create distracting flares because of its exposed edge of glass.

有时，分光镜会因其暴露的玻璃边缘产生令人分心的光斑。