Tips & Tutorials

Camera Basics #12: The Viewfinder

When it comes to shooting, a vital part of the camera is the viewfinder. Nowadays, there are cameras that do not come with viewfinders, only with Live View shooting. However, as you get more experienced with photography, you will realise how much shooting with a viewfinder can affect your photos. In this article, we take a closer look at the viewfinder. (Reported by: Tomoko Suzuki)


The optical viewfinder allows you to concentrate on your subject


- Prevents external light from interfering with your shoot.
- Allows you to concentrate on the subject without distraction.
- Easy to keep track of moving subjects.

The viewfinder is a small window on the camera which look through in order to compose your photo and establish focus on a subject. The difference between Live View shooting, where you use an LCD monitor, and viewfinder shooting is that in the latter, external light is prevented from affecting how you perceive the display on the screen. This allows you to put full attention on the subject right before your eyes, which in turn makes it easier to track moving subjects.

A digital camera is equipped with either one of two types of viewfinders: the optical viewfinder (OVF) and the electronic viewfinder (EVF).

The optical viewfinder (OVF) is mainly found on DSLR cameras such as the EOS 77D and EOS 1300D. On such cameras, light passing through the lens is reflected off a mirror and into the viewfinder, which enables you to shoot while viewing the actual image. The advantage of this is that you can track moving objects more easily, and also have a more accurate view of colours. On the other hand, since the mirror is necessary for reflecting light, there is a limit on how compact the camera can be made. Preview of the effects of white balance and exposure compensation is also not available.

Meanwhile, the electronic viewfinder (EVF) is usually found on mirrorless cameras such as the EOS M5. It electronically projects the image captured by the image sensor onto a small LCD panel, and this is what you are really looking at when you look through the EVF. Since there is no need for a mirror in this case, cameras can be made much more compact. You can enlarge the view on the focus area and check the effects of adjusting colour and brightness before shooting. However, since an EVF consumes relatively more power, it may expend slightly more battery life.


Optical viewfinder

Mostly featured on DSLR cameras


- Able to view the subject in real time
- It is easy to track moving subjects
- Accurately detects colours of the subject

- A limit to how compact the camera can be
- Unable to review the effects of white balance and exposure compensation before releasing the shutter


Electronic viewfinder

Mostly featured on mirrorless cameras


- Cameras can be made more compact
- Ability to enlarge the view in order to establish focus
- Can review the effects of white balance and exposure compensation before releasing the shutter

- Consumes slightly more power


Concept 1: Shoot moving subjects with the OVF

EOS-1D X Mark II/ EF500mm f/4L IS II USM/ FL: 500mm/ Manual exposure (f/11, 1/320 sec, EV±0)/ ISO 100/ WB: Auto


The reason OVF excels in shooting moving objects is due to its ability to use phase detection AF. Because image plane phase detection AF is able to achieve focus at an extremely high speed, it is the most suitable AF mode for shooting moving subjects.

Until recently, most people would automatically associate shooting moving subjects with the use of an optical viewfinder. However, with the introduction of Dual Pixel CMOS AF which implements image plane phase detection AF, it is now possible to take photos of moving objects with an electronic viewfinder. In particular, the EOS M5 is able to shoot at a continuous speed of 7 fps, and combined with its use of the latest image processor, DIGIC 7, enables moving subjects to be captured at a very high accuracy.

For an introduction to Phase Detection AF, also known as phase-difference detection AF, check out:
Camera Basics #11: Phase Detection AF


Concept 2: Review the effects with EVF before shooting

WB: Auto
Exposure compensation: EV±0
Due to backlight coming in from the window, the lamp appeared dark in the picture. This is a situation where you would use exposure compensation to obtain a brighter effect.

WB: Daylight
Exposure compensation: EV+1.0
Set the exposure compensation to EV+1.0 and the WB to Daylight. In this example, the EVF enables you to check that the image now looks brighter, before releasing the shutter.

Both images: EOS M/ EF-M22mm f/2.0 STM/ FL: 22mm (35mm equivalent)/ Aperture-priority AE (f/2, 1/320 sec)/ ISO 100


The biggest advantage of the electronic viewfinder is that while shooting, it enables you to preview the effects of changing the settings before taking the photo. In this way, the EVF has a greater advantage over the OVF, which requires you to check the image after shooting over and over again.


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Digital Camera Magazine

A monthly magazine that believes that enjoyment of photography will increase the more one learns about camera functions. It delivers news on the latest cameras and features and regularly introduces various photography techniques.
Published by Impress Corporation

Tomoko Suzuki

After graduating from the Tokyo Polytechnic University Junior College, Suzuki joined an advertisement production firm. She has also worked as an assistant to photographers including Kirito Yanase, and specializes in commercial shoots for apparels and cosmetic products. She now works as a studio photographer for an apparel manufacturer.


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Comments (1)

您好~ 在拍攝夜景的時候,用一樣的光圈值,光學觀景器和LCD測出來的快門數值,卻差很多~ 不知道用哪一個來拍攝,快門值比較標準,謝謝^^

您好,由於我們尚未完全瞭解您所面對的情況,而且拍攝夜景也受到各種因素影響,所以難以確定您的問題。 若您提到的「LCD」指的是即時顯示拍攝模式,那麼可能是因為觀景器的AF點設置與即時顯示模式的AF點設置不同(例如,光學觀景器的AF點設在明亮的街燈上,而即時顯示模式的AF點則設在陰暗的天空)。這通常會發生在含有高對比的場景中,但我們建議您嘗試比較相機在不同場景中測得的快門速度。同時,您還可以確認所使用的測光模式,因為不同的模式也可能影響快門速度。若問題仍持續發生,請就近至Canon客服中心尋求協助。

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