If you skillfully manipulate the aperture, shutter speed, and ISO sensitivity of your digital camera, you will be able to create a variety of expressions. It may seem difficult to master, but the "ISO sensitivity" featured this time is an element that is easy to control once you understand it. This is useful when you want to take bright photos or high-quality photos. In this article, we will explain the basics of ISO sensitivity along with the relationship between aperture and shutter speed.
Basic camera knowledge to remember! What is ISO sensitivity?
ISO sensitivity is the degree to which the image sensor (imaging element) inside the digital camera senses light.
The image sensor is a component that converts the light captured by the lens into an electrical signal. It is a good idea to increase the ISO sensitivity when shooting in dark places or when you want to increase the shutter speed/aperture value.
For shutter speed and aperture, please refer to the latter half of the article or the link below.
[Reference] How to master the "F value" and "Aperture" to take cool photos by manipulating the bokeh feeling with the camera
Useful when using a digital camera! The relationship between aperture, shutter speed, and ISO sensitivity
Let's think about it in a simpler way. The relationship between aperture, shutter speed, and ISO sensitivity is often likened to a water supply.
■Light = tap water ■Aperture = degree of faucet opening / amount of water ■Shutter speed = time to add water ■Appropriate exposure (appropriate brightness) = glass filled with water
And ISO sensitivity is like ice that bulks up a container of water.
If you add more ice (increase the ISO sensitivity), you can fill the glass with water without changing the faucet opening (aperture) or time (shutter speed).
Watch out for image quality degradation! How to set the ISO sensitivity
Many digital cameras have modes such as "auto", "manual", "aperture priority", and "shutter speed priority". The setting method depends on the model, but in principle, the ISO sensitivity can be set to any value in any mode.
However, if you increase the value too much, the image quality will be affected, such as the photo becoming grainy or the sharpness being reduced. The lowest setting is best when shooting outdoors in sunny weather.
If you increase the ISO sensitivity of the camera too much, noise will appear!?
Actually, I changed the ISO sensitivity and shot. ISO 1250 on the left and 25600 on the right. Image quality is degraded on the right.
The appeal of high-end cameras is wide-ranging, but the above reasons are also related to why cameras with large sensors and high prices are considered good.
[Reference] What is the difference between full size and APS-C? Basic knowledge of camera sensor size that you should know before buying
Isn't "ISO" a camera term? Readings and Surprising Meanings
ISO is read as "Iso" or "I.S.O." ISO is not a technical term for cameras, but an abbreviation for "International Organization for Standardization." In other words, ISO sensitivity is the international standard sensitivity set by the ISO organization.
You can also change the ISO sensitivity setting on your smartphone
Many smartphone cameras allow you to change the ISO sensitivity setting. However, as mentioned above, noise tends to stand out in cameras with small sensor sizes. The sensor size of a typical smartphone camera is 1/2.3 type, which is about 1/30 the size of a full-size sensor, so noise tends to occur in high-sensitivity shooting.
Basic knowledge to remember along with ISO sensitivity! Aperture (F-number) and shutter speed of a camera
The brightness of a photograph can be controlled by the balance of three elements: "aperture (F-number)", "shutter speed" and "ISO sensitivity".
How to change the shutter speed of the camera
Shutter speed indicates how long the shutter curtain in front of the sensor opens. increase.
To change the shutter speed, use "Shutter speed priority mode (S mode, SS mode, Tv mode, etc.)" or "Manual mode (M mode)". In shutter speed priority mode, the shutter speed and ISO sensitivity can be set to arbitrary values, but the F-number is automatically determined by the camera.
What happens if I change the camera shutter speed setting?
Because the camera allows light to hit the sensor while the shutter curtain is open, the slower the shutter speed, the more light comes in and the brighter the photo. On the other hand, the faster the shutter speed, the less light there is and the darker the image.
Moment? Dynamic? Change the subject's movement by changing the shutter speed
You can freeze the "moment" by increasing the shutter speed, and capture the "motion" by decreasing it.
The left photo was taken with a shutter speed of 1/2000 second and the right one with a shutter speed of 1/15 second. The water on the left appears to stop moving, while the water on the right appears smooth.
You can also prevent camera shake by increasing the shutter speed. In places with some brightness, increase the shutter speed so that the photo is not blurred. It is safe if you can secure about 1/60 second.
[Basic knowledge of cameras] What is F number (aperture value)?
By changing the "F number" or "Aperture value", you can control the brightness and depth of field (bokeh effect) of the photo.
From left to right: f/2.8, f/8, f/22. The smaller the f-number (= open the aperture), the stronger the bokeh effect, and the larger the f-number (= narrower aperture), the more in-focus it appears overall.
Also, if the shooting conditions are the same, the smaller the F number, the brighter the photo. Please refer to the following article for details.
[Reference] How to master the "F value" and "Aperture" to take cool photos by manipulating the bokeh feeling with the camera
So far, I have explained about ISO sensitivity. At first, it is okay to think that increasing the ISO sensitivity will make it brighter, and lowering it will make it darker. Set it to the minimum value as long as the brightness is sufficient, and raise the ISO sensitivity when it is dark, paying attention to noise. Please try to manipulate the ISO sensitivity without thinking too much.
*Data is based on research by the editorial department as of late October 2020. *Although every effort has been made to ensure the accuracy of the information, we do not guarantee the completeness or accuracy of the content. * Please use and operate the product at your own risk.
Sentence/bommiy