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Article: [Beginners] 3 elements when you want to change the brightness in the camera settings

【初心者向け】カメラの設定で明るさを変えたい時の3つの要素 - PHOTOPRI【写真展・美術展品質のプリントサービス】

[Beginners] 3 elements when you want to change the brightness in the camera settings

Camera settings

Everyone, camera settings are full of numbers and don't make any sense.

This time, I will teach you three factors that change the brightness of a single-lens reflex camera.

Once you understand this, no matter what mode you're using, you'll know which option to tweak when you want to increase the brightness.

shutter speed

As you can read, it represents the speed of the shutter .

The shutter speed of a camera indicates how long the shutter is open to let in light.

Of course, the longer you open it, the brighter the photo.

Conversely, the shorter it is, the darker the picture will be.

Note that the longer the shutter speed, the more likely camera shake and subject blurring will occur.

If you want to take a picture of a moving person, using a long shutter speed will inevitably blur the subject.

If you're shooting handheld with a camera that doesn't have image stabilization, keep it to about 1/100.

Aperture value

Camera aperture setting F value

A camera has a blade called an aperture spring in front of the shutter.

The blades regulate the amount of light going to the shutter.

The aperture value is the numerical value of the diameter of the blades.

It is also known as the F value , which is confusing.

The higher the number, the darker the image.

The smaller the number, the brighter


How much you can reduce the number depends on the lens.

A so-called bright lens is a lens that can have a small f-number.

Note that the smaller the number, the brighter the image, but the smaller the area in focus.

Even if you want to make it brighter, if you set the number to the smallest value, one person in the two-shot photo may be out of focus!

ISO sensitivity

ISO sensitivity (Isokando or IS Aukand) is the sensitivity (level) for capturing light.

The higher the level, the more sensitive the light will be captured.

There are numbers here as well, but think of it as if you could take brighter photos by leveling up (higher numbers).

Then, those who thought that it would be the strongest if the level was MAX!

Please note that noise will occur if you take a picture with the level MAX.

Originally, there is a lot of noise in the photo, and the noise is suppressed to the extent that it cannot be seen in photos with low ISO sensitivities.

I will briefly explain why the noise is generated.

Everyone talks on the phone, but when you raise the volume of the call because you can't hear the other person's voice, the environmental sounds and noise also go up.

When I turn up the volume and play it back, there is a noise that goes like "Shhhh".

If you increase the ISO sensitivity and amplify the light, you get a "gritty" noise.

Such an image.

I would be happy if you could grasp it somehow.


The above three were the factors that determined the brightness!

I think it will be easier to take pictures if you decide the settings in the order of 1 to 3.

    1. shutter speed

⇒ Set the optimal value depending on whether the subject moves or not

    1. Aperture

⇒Determine the range you want to focus on and set the value

    1. ISO sensitivity

⇒Compensate for insufficient brightness based on 1&2

Let's take a picture while adjusting the balance of brightness based on the three elements!

who wrote this article

Yuta Matsumura

Representative of PHOTOPRI

  • Representative of PHOTOPRI
  • Working as a food and portrait photographer
  • The family is in the printing business
  • Active as a shoe designer
  • Also in charge of PHOTOPRI site creation


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