Traditional Culture Encyclopedia - Photography major - Micro-single photography skill
Micro-single photography skill
What ISO (automatic ISO?
Automatic ISO is very helpful for hand-held shooting.
Usually in aperture priority, shutter priority or full manual mode (except automatic mode), the ISO value needs to be adjusted to a certain value before shooting, for example, in bright environment, the ISO value will be lower to maintain the photo quality; In the case of insufficient light, high ISO is often used to improve the sensitivity and keep the shutter at a safe shutter (when holding). But sometimes when the light changes greatly (such as from indoor to outdoor, there are different light sources on site, etc.). ), we need to adjust the aperture and shutter, and quickly set the ISO value to take high-quality photos, which will often slow down the shooting speed, and Auto ISO can effectively solve this problem!
Assuming that the aperture priority mode (A mode) is used, the principle of automatic ISO is that the camera will automatically set ISO according to the built-in metering of the camera at that time, the aperture adjusted by the photographer and the "preset slowest shutter/highest sensitivity" (explained later), so that you only need to concentrate on adjusting the aperture and composition when shooting, and the camera will set the best shutter and ISO for you, saving a lot of time!
Matters needing attention when using automatic ISO
When using automatic ISO, we need to pay attention to the following details:
This picture shows Nikon model, and Canon, Sony or other models have similar settings.
You must set the "default slowest shutter" carefully.
Usually, in the "Auto ISO" option in the menu, you can also find a place to set the slowest shutter for you, which means that the shutter of the camera can't be slower than this value at any time, which is very important for the "safe shutter"! For example, we use a wide-angle lens of 16mm, so we set the slowest shutter value to 1/50 seconds, so that the shutter can always be kept at a safe shutter; When using a 200mm telephoto lens, the slowest shutter of 1/200 seconds will be set, so don't be afraid of hand shaking when shooting!
Set the "Maximum Sensitivity" according to the camera quality.
The "Maximum Sensitivity" option is the highest sensitivity set by the camera itself. Usually, I will set it to the next level where the highest level can be set. For example, the maximum ISO allowed for a camera is 6400. I will set this to ISO3200, so that the photos will not be too noisy.
Different photometric methods will affect the ISO value.
In the final analysis, the camera will determine the ISO value according to the metering at that time, so be careful to use the appropriate metering mode. If you are not sure which one to use, choose "full area metering" (or similar)!
When can't I use automatic ISO?
We don't use automatic ISO to shoot track, running water and night scenes.
Although automatic ISO is very convenient (especially when shooting events quickly), it cannot be used in some cases, such as shooting night scenes, graffiti, car tracks, or adjusting the shutter value by yourself (manual mode, when using a tripod). At these times, we have to ensure that the ISO is low to maintain the photo quality, and it is no problem to slow down the shutter. Turning on automatic ISO will make the camera set its own high ISO, which is meaningless. You should be more careful!
Using automatic ISO allows you to concentrate on composition and adjust the appropriate aperture, which is very useful for beginners!
Many experienced photographers don't advocate the use of automatic ISO, but according to my previous shooting experience, I still recommend novices to use new technologies that are convenient for them, which makes shooting easier. Moreover, the sense of achievement in taking good photos is the driving force for further study. Why not do it? Of course, the premise is that when using these convenient technologies, we must also clearly understand the principles and characteristics behind them in order to play the greatest role!
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