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

- 在摄中，“屈光”实际上是对近摄接圈一个技术性误称。

The split diopter was popularized by groundbreaking cinematographer Gregg Toland.

分光双焦点镜头普及归功于开创性摄师格雷格·托兰德。

The use of split diopters began to spread.

分隔 diopters 使用开始流行。

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

首先，我们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调节功能，因佩戴眼镜或接触人无需佩戴额外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，他们通常会先观察场景布局情况。

Diopter strengths are like most lenses measured in meters.

- 屈光与大多数透镜一样，以米为单位进行测量。

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

使用正一屈光透镜，一米远物体将处于焦点上。

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

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

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

所以有一个稳定底座非常重要，他们只是借用了标准屈光和标准工具。

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

在《百万美元宝贝》中，这种分隔镜头调了角色之间关系。

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

- 分割 diopter 拍摄固有有一种诡异感。

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.

分视棱镜指是当这种近摄适配器仅覆盖镜头一部分时，使得镜头可以有两个独立焦平面。

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.

这将让他们对所需分光镜有所了解，——但只有你们中一个在咖啡里下了毒。

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

- 分光镜效果图像会因镜头焦距不同而变化。

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视线在屏幕上落点。

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《漫长航程》中，托兰德采用了不同技术， 通过使用分光镜来达到类似效果， 从而实现了这一镜头。

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

有时，分光镜会因其暴露玻璃边缘产生令人分心光斑。

Achieving a split diopter shot can be time-consuming and demanding.

实现分光镜镜头拍摄既耗时又要求高。