ISO is one of the three main pillars in photography. The other two important pillars are shutter speed and aperture size. ISO will have a huge impact on your images. But what effect does the amount and sensitivity of your Camera ISO have on the final image? In this article, we will examine this concept, introduce it and how it affects photos. Beginners in photography are familiar with this concept at the end of the article and are prepared to use it to capture the best images.
What is ISO?
We must first introduce ISO. Simply put, ISO is one of the Camera settings that makes your photos light or dark. As the ISO value increases, your images become brighter. Because of this, ISO can help you shoot in low light and relatively dark environments, or you can be more open in choosing and adjusting the aperture size and shutter speed.
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However, increasing the ISO is not without its drawbacks and has consequences. Photos taken at very high ISOs are not very high quality and have a lot of so-called noise and may be unused. Therefore, turning on a photo using ISO can also have side effects, and we should only use this tool to brighten images when this is not possible using aperture resizing or shutter speed. For example, if speeding up (which increases the brightness of the image) is not possible and blurs the image, you have no choice but to increase the ISO.
What does ISO mean?
ISO actually stands for International Organization for Standardization. However, the ISO used in cameras does not directly refer to an organization that sets different standards for different products and technologies. In fact, there were two standards called ASA and DIN in photography and videography, which were merged in 1974 and became known as ISO. ISO initially only referred to the sensitivity of films, but later digital Camera makers also used the term. Because it works for almost the same purpose, which is to keep the brightness level in photos.
Common ISO values
Each Camera supports a specific range of ISO values, sometimes called ISO speeds. Called. Therefore, you can only use the values supported by your camera. The most common set includes the following: ISO 100 (Low ISO) ISO 200 ISO 400 ISO 400
ISO 800> ISO 1600
ISO 6400 (high ISO)
The choice of these figures and the relationship between them is very simple. When the ISO number is doubled, you are actually doubling the brightness of the image; Therefore, an image with ISO 400 is twice as bright as an image with ISO 200.
What is the basic ISO? This value is very important, because
this value determines the ability to take the highest quality
photos on your camera. In fact, the lowest ISO value would
mean the lowest Noise and light and color flaws in the image.
Therefore, the lower the value, the higher the quality of your
image. This is why basic ISO is so important. The base
ISO was 200 on most older DSLR cameras, but some of today's
more modern cameras also support ISO 100. However, remember
to use the same amount of basic ISO as much as possible to
get the most out of your images. However, this is not always
possible. Especially when the ambient light is not enough,
you will have to increase the ISO value of the
Some cameras have extra HI and LO values in the range of values They have their own natural ISO. Remember not to use these features. Because these values are not real and only simulate and reduce the quality of your images.
View Noise at low and high ISO values
ISO reduces the quality of your image and adds noise to the image. The following images were taken in similar conditions and with different ISOs. With a little care, you will clearly notice the difference in their quality. Pay attention to the size of the Noise and the spots created in the photo.
The difference is quite clear: a photo Taken with ISO 3200, Noise has much more than ISO 200. In the photo on the left, we have tried to provide the necessary exposure by increasing the shutter speed. This is why you should avoid increasing the ISO value as much as possible.
How to change the ISO value?
How to change The ISO value depends on your digital camera. But in general, there are a few common ways to do this:
- To get started, select one of the Camera modes that allows you to manually adjust the ISO. So you have to choose one of the modes Manual, Shutter Priority, Aperture Priority or Program. We recommend that you use either Manual mode or Aperture Priority. For more information, read the full introduction to Camera Mode.
- For beginner or mirrorless DSLR cameras, you should probably open the Camera menu (perhaps the Quick Menu section) and there ISO Find. Then enter the value you want or set it to automatic.
- On more professional cameras, there may be a dedicated ISO setting button. you can adjust the ISO of your Camera by pressing or rotating this button. If you do not see an ISO button on the camera, it is likely that the Camera will allow you to assign and adjust a button yourself.
- Some more advanced cameras may also have a dedicated ISO button. By rotating it, you can select and adjust different values.
However, if you are unsure of the mechanism and method of setting the ISO on your camera, it is best to refer to the manual. . However, we recommend that you learn and master the ISO setting method well. Sometimes you need to change this amount quickly and often. Especially when you are planning to shoot in a dimly lit environment without using a flash. So more familiarity with adjusting it can help you a lot.
What degree of ISO should we use?
Many photographers understand the basic concepts of ISO well, but At the time of selection and shooting, they still do not know what value to choose for the ISO of their cameras. In practice, there is a specific reason for offering a wide range of ISO values in cameras. Each of these values is better suited for specific environmental conditions. Here are some of the most common ISO setting scenarios.
When to use a low ISO?
As mentioned earlier, always you should try to use the lowest ISO value of your Camera (basic ISO). This is a probable value of ISO 100 or ISO 200. If the ambient light is high enough, you will have no problem doing so, and with the lowest ISO size, you can capture the best image quality with the least noise.
Even in dark and dim environments Maybe you can use low ISO. For example, if your Camera is on a tripod or you place it on a table, you can still use low ISO, but instead slow down the shutter speed and use a longer shutter speed. This will make the Camera collect more light and make your photo brighter. Since the Camera is mounted on a tripod, you will not notice the main threat of long shutter speeds (image shake and blur). But remember, when you use a long shutter, anything moving in the image may look like a ghost!
Of course, in the photo above, we have added a little joke to the photo. In this photo, we were going to test a long exposure. So we set the ISO to a minimum so that the details remain intact. Instead, we slowed down the shutter speed to 5 seconds. The subject of the photo was fixed in these 5 seconds, but one of our friends appeared in the frame for a short time of these 5 seconds and played the role of a pseudo! His image is blurred because he was not in the frame for all 5 seconds.
When to use a high ISO?
Although using a low ISO is ideal , But there are many cases where you have to use high ISO to be able to take good photos in the first place. There's a simple reason for this: to use the low ISO, we need to slow down the shutter speed instead to get the right exposure. It is not possible to use long shutter speeds to photograph moving objects, and we encounter the Motion Blur phenomenon. That is, moving subjects were blurred in the photo (like the previous photo). Two modes are created: either we take a clear photo without Noise, but we lower it with ISO by blurring the subject. Or the subject of our photo is obvious, but the photo has more Noise. Therefore, we must choose the right balance between ISO and shutter speed so that the exposure is good and at the same time we do not suffer from Motion Blur. In this case, we have to increase the ISO value.
Take this photo at a speed of 2000 m I took it with ISO 800. Here we needed to take a photo with a fraction of 2,000 m/s to record the bird's movement in the sky completely and without vibration. In this situation, if we wanted Using ISO 100, what would happen? In this case, we had to use a shutter speed of 1.250 m (one friend and fifty) seconds to have a clear image. In this case, there was a lot of shaking and blurring in the photo, because the birds were moving at a high speed and their trajectory was disappearing throughout the photo. In other words, our photo would be destroyed!
All in all, we had to increase the ISO of the photo to have enough light to capture a clear and beautiful photo at fast shutter speeds. In similar situations, if we are going to shoot indoors without a flash, it is still better to increase the ISO value so that the photo has enough light and at the same time to avoid additional vibrations caused by slowing down the shutter speed. Likewise, it is not possible to shoot very fast subjects without increasing the shutter speed. Because by increasing the shutter speed (for shooting fast subjects), not enough light enters the lens and we have to solve this problem by increasing the ISO.
Most cameras also have Auto ISO mode, which adjusts the ISO value. Adjusts automatically to fit other variables (shutter speed and aperture size). This mode usually works well in low light environments. The most attractive part of this Camera feature is that it allows you to enter the maximum ISO you want. Therefore, if we want to limit the Noise of the image, it is better to set a reasonable ceiling for ISO. In our opinion, ISO 800 to ISO 1600 can be a good choice. The disadvantage of this mode is when shooting in low light environment, and if this amount of ISO is not enough for the brightness of the image, the Camera slows down the shutter speed and as a result may cause more shake and blur in your photo. Therefore, it may be best not to be too strict in choosing an ISO ceiling. ISO 3200 or even higher will be required for photography in some situations. The quality is to always use the basic ISO. But this is a misconception. As shown in the example above, sometimes you have no choice but to increase the ISO value of your camera.
- 5 Important Tips for Improving Image Quality in Photography
To enhance and maximize photo quality, follow these four steps in Note:
- Select aperture size settings so that you can give the right depth to the photo.
- Set the Camera ISO to the base ISO value (usually 100 or 200) Adjust the shutter speed to suit the exposure of the image. Selecting auto mode for shutter speed can also be a good choice.
- If the subject of your photo is blurred and the image is shaken, gradually increase the ISO value, until the image is no longer blurred and shaken. li>
- If you feel that the ISO size is too high, you can go to the aperture and choose a larger size. As you know, the larger the aperture, the more light enters the lens and the better your exposure. you can also use this method to better manage the ISO size and avoid raising it too high. But keep in mind, this can cost you some of the depth of your image.
As mentioned, shutter speed, aperture size, and ISO are the three main sides of a triangle. They are photography. As a photographer, you should try to strike the right balance between these three elements. Ideally, you can store Everything together well. But as the situation becomes more specific, you may need to revise the settings and balance as you wish.
If you follow the above, you can easily improve the quality of your photos. Maximize and strike the right balance between Noise, Motion Blur, and Image Depth. There is an ISO. In this section, we are going to answer some of the most common questions.
Is ISO the same as sensor sensitivity?
This is one of the most common questions and concerns about ISO. In many articles published on the Internet, you will find that ISO is the same as sensor sensitivity Is. While this may help you to imagine that the ISO works "like" the Camera sensor, this claim is incorrect and the ISO performance is different. Digital sensors have only one sensitivity and that has nothing to do with ISO. It is safe to say that ISO is a map that tells your digital Camera how bright your photo should be.
Is ISO part of the exposure?
No. ISO is not part of the exposure. Shutter speed and aperture size physically help your Camera absorb more light. But ISO performance is different and does not work physically. Instead, ISO can be considered a program that makes the captured image brighter. For this reason, photographers do not consider ISO to be part of Camera and photo exposure.
Is increasing the ISO of an image the same as turning on photos with a computer?
This is a very interesting question, but it's a case in point. Another misconception about ISO cameras is. Turning on images on a computer is similar to raising the ISO in many ways, as it also increases image noise. But the main difference between the two methods is that increasing the ISO in the Camera can always lead to higher quality photos than increasing the brightness of the photo using a computer. In other words, instead of trying to lighten an ISO 800 captured image with photo editing programs like Lightroom or Photoshop, it is better to use ISO 800 if necessary.
- Photoshop vs. Lightroom; Which one should we choose to edit the photo?
What is the effect of ISO on the photo?
ISO increases or decreases the brightness of your photo. But it also affects the noise level of the images and their dynamic range. At the lowest ISO (or base ISO), your photo has the lowest Noise and the most dynamic range. So you will have the most flexibility when editing photos. As the ISO increases, the image noise levels increase and the dynamic range of the image naturally decreases.
What is the best ISO for shooting in low light environments?
When it comes to shooting in the environment In low light, the shutter speed decreases automatically and your image may blur or blur. To avoid a problem, you should increase the ISO value to balance the exposure. you need to select and increase the ISO depending on the aperture and ambient light conditions.
What is the best ISO Camera for nature
photography? Be careful, you should use 3 pins and set your
Camera ISO to the ISO value (usually