This is 'What is a split diopter'.

这是“什么是分裂双凸透镜”。

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

- 在电影摄影中，“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功于开创性的电影摄影师·兰德。

The use of split diopters began to spread.

分 diopters 的使用开始流行。

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开来，增强了偷听的感觉。

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.

该设备了屈光度调节功能，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。

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。

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的布局情况。

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。

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。

One of the most attention-grabbing techniques in DP's arsenal is the split diopter shot, which can add an entirely new layer to a frame.

在DP的众多引人注目的技巧中， 分光镜镜头堪称一绝，它能为画面增添全新的层次。

If the two focus planes are closer, the diopter can be more subtle, like a plus half.

若两焦平面较为接近，则可选用更为精细的矫正镜片，如正半号镜片。

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。

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。

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。

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。

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的强度有所了解，——但只有你们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年的电影《漫长的航程》中，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。

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

在《百万美元宝贝》中，这种分镜头强调了角色之间的关系。