2024年6月14日发(作者：赵闵)

中画幅与全画幅焦距换算关系

英文回答：

The conversion between focal lengths of medium format

and full frame cameras is a common concern among

photographers. Understanding this relationship is important

when considering lens compatibility and the field of view.

Here, I will explain the conversion ratio between the two

formats and provide some examples to illustrate the concept.

In photography, the focal length of a lens determines

the angle of view and the magnification of the subject. It

is usually measured in millimeters (mm). The larger the

focal length, the narrower the angle of view and the higher

the magnification.

Medium format cameras have larger image sensors

compared to full frame cameras. As a result, medium format

lenses have a wider field of view and a shorter focal

length compared to full frame lenses. To convert a medium

format focal length to its full frame equivalent, you need

to multiply it by a conversion factor.

The conversion factor varies depending on the specific

medium format and full frame cameras being compared.

However, a common conversion factor is approximately 0.6.

This means that a medium format lens with a focal length of

80mm is roughly equivalent to a full frame lens with a

focal length of 48mm (80mm x 0.6 = 48mm).

To illustrate this further, let's consider a scenario

where I have a medium format camera with a 120mm lens and a

full frame camera with a 50mm lens. By applying the

conversion factor, I can determine the equivalent focal

length for the full frame camera.

120mm (medium format lens) x 0.6 = 72mm (full frame

equivalent)。

Therefore, the 120mm lens on the medium format camera

has a similar field of view as a 72mm lens on the full

frame camera.

It's important to note that the conversion factor is

just an approximation and may vary depending on the

specific cameras being compared. Additionally, the

conversion factor only applies to the focal length and not

other lens characteristics such as aperture or image

quality.

中文回答：

中画幅和全画幅相机的焦距换算关系是摄影师们常关注的问题。

了解这种关系对于考虑镜头兼容性和视野范围非常重要。在这里，

我将解释两种格式之间的换算比例，并提供一些例子来说明这个概

念。

在摄影中，镜头的焦距决定了视角和主题的放大倍率。焦距通

常以毫米（mm）为单位进行测量。焦距越大，视角越窄，放大倍率

越高。

中画幅相机的图像传感器比全画幅相机要大。因此，中画幅镜

头具有更宽的视野和较短的焦距。要将中画幅焦距转换为全画幅等

效焦距，需要将其乘以一个换算因子。

换算因子取决于具体比较的中画幅和全画幅相机。然而，常见

的换算因子大约为0.6。这意味着焦距为80mm的中画幅镜头大约相

当于焦距为48mm的全画幅镜头（80mm x 0.6 = 48mm）。

为了进一步说明这一点，让我们考虑这样一个情景，我有一台

焦距为120mm的中画幅相机和一台焦距为50mm的全画幅相机。通过

应用换算因子，我可以确定全画幅相机的等效焦距。

120mm（中画幅镜头）x 0.6 = 72mm（全画幅等效焦距）。

因此，中画幅相机上的120mm镜头与全画幅相机上的72mm镜头

具有类似的视野范围。

需要注意的是，换算因子只是一个近似值，可能因具体比较的

相机而异。此外，换算因子仅适用于焦距，而不适用于其他镜头特

性，如光圈或图像质量。

2024年6月14日发(作者：赵闵)

中画幅与全画幅焦距换算关系

英文回答：

The conversion between focal lengths of medium format

and full frame cameras is a common concern among

photographers. Understanding this relationship is important

when considering lens compatibility and the field of view.

Here, I will explain the conversion ratio between the two

formats and provide some examples to illustrate the concept.

In photography, the focal length of a lens determines

the angle of view and the magnification of the subject. It

is usually measured in millimeters (mm). The larger the

focal length, the narrower the angle of view and the higher

the magnification.

Medium format cameras have larger image sensors

compared to full frame cameras. As a result, medium format

lenses have a wider field of view and a shorter focal

length compared to full frame lenses. To convert a medium

format focal length to its full frame equivalent, you need

to multiply it by a conversion factor.

The conversion factor varies depending on the specific

medium format and full frame cameras being compared.

However, a common conversion factor is approximately 0.6.

This means that a medium format lens with a focal length of

80mm is roughly equivalent to a full frame lens with a

focal length of 48mm (80mm x 0.6 = 48mm).

To illustrate this further, let's consider a scenario

where I have a medium format camera with a 120mm lens and a

full frame camera with a 50mm lens. By applying the

conversion factor, I can determine the equivalent focal

length for the full frame camera.

120mm (medium format lens) x 0.6 = 72mm (full frame

equivalent)。

Therefore, the 120mm lens on the medium format camera

has a similar field of view as a 72mm lens on the full

frame camera.

It's important to note that the conversion factor is

just an approximation and may vary depending on the

specific cameras being compared. Additionally, the

conversion factor only applies to the focal length and not

other lens characteristics such as aperture or image

quality.

中文回答：

中画幅和全画幅相机的焦距换算关系是摄影师们常关注的问题。

了解这种关系对于考虑镜头兼容性和视野范围非常重要。在这里，

我将解释两种格式之间的换算比例，并提供一些例子来说明这个概

念。

在摄影中，镜头的焦距决定了视角和主题的放大倍率。焦距通

常以毫米（mm）为单位进行测量。焦距越大，视角越窄，放大倍率

越高。

中画幅相机的图像传感器比全画幅相机要大。因此，中画幅镜

头具有更宽的视野和较短的焦距。要将中画幅焦距转换为全画幅等

效焦距，需要将其乘以一个换算因子。

换算因子取决于具体比较的中画幅和全画幅相机。然而，常见

的换算因子大约为0.6。这意味着焦距为80mm的中画幅镜头大约相

当于焦距为48mm的全画幅镜头（80mm x 0.6 = 48mm）。

为了进一步说明这一点，让我们考虑这样一个情景，我有一台

焦距为120mm的中画幅相机和一台焦距为50mm的全画幅相机。通过

应用换算因子，我可以确定全画幅相机的等效焦距。

120mm（中画幅镜头）x 0.6 = 72mm（全画幅等效焦距）。

因此，中画幅相机上的120mm镜头与全画幅相机上的72mm镜头

具有类似的视野范围。

需要注意的是，换算因子只是一个近似值，可能因具体比较的

相机而异。此外，换算因子仅适用于焦距，而不适用于其他镜头特

性，如光圈或图像质量。