Secondly, you might be shooting in low light, and want to use as large an Aperture as possible, so that you can use a fast shutter speed, thus avoiding camera shake blur. That is to say, typically, large aperture lenses are more expensive than smaller aperture lenses, as it is technically more complex to create a large aperture lens. So how do you know what Aperture a lens is capable of being set to?
This information is always found in the naming convention of a lens, as well as being printed on the lens itself. For example, the EF 85mm F1.
A zoom lens will often support a different maximum Aperture, depending on the focal length. Therefore, the lens will quote the maximum aperture size at its widest angle, to the maximum aperture size at telephoto. View the glossary. At the maximum aperture setting, objects located in front of the subject also appear blurry, thus making the subject stand out sharply.
A brighter lens with a large aperture F value has a shallower depth of field, thus producing greater blurriness. When the aperture is set at the midpoint, the image starts to become softer at mid-depth, and farther subjects appear blurrier.
Everything from the foreground to the distant background appears sharp. In addition to the aperture, the lens' focal distance affects depth of field. A shorter focal distance for the lens and a longer distance to the subject being focussed will result in greater depth of field.
For a pan-focus effect, i. The f-number is the focal length divided by the "effective" aperture diameter. Aperture controls how bright your photo is. Using the aperture to control the amount of light that comes through your lens is sometimes a creative choice you make. Other times you may be forced to choose a certain aperture based on the available light you have in your scene.
The larger the f-number, the smaller the aperture. The smaller the f-number, the larger the aperture. If I gave you the mathematical explanation about diaphragms and factors of light, this would be just like every other boring article on aperture out there, so just remember this instead:.
The picture below should help explain this better. You can see the maximum aperture written on the lens somewhere. Why do pros need expensive lenses with larger apertures? One of the main reasons is to be able to take photos in low light , without having to use a flash on their cameras.
Using aperture you can control what elements are in and out of focus in a photo to help tell a story. Why might you want sharp vs blurry areas in your photos? In a photo of a flower, for example. Using a smaller aperture to create a deeper depth of field is popular with landscape and architecture photography, where the photographer usually wants the entire scene to be in tack-sharp focus.
The bigger the opening in your lens, the smaller the in-focus area of your photo… and the greater the amount of out-of-focus blurry areas. No blurro! Check out the photo below to see what I mean:. The effect of the distance-to-subject on the depth of field amount in focus.
In the mean time, you can also read our article: what is deep depth of field in photography? As I mentioned before, you should find the maximum size of your lens aperture written somewhere on your lens.
0コメント