4 Things You Should Know About Focal Length and Composition
Aperture & Depth of Field Photography Guide  FREE PDF DOWNLOAD OF THIS GUIDE F-stop is the ratio of lens focal length to aperture diameter. . Download the Exposure Triangle Cheat Sheet which shows the relationships. Click to explore the relationship between the aperture and shutter speed. But in other ways, it does make a difference, and it is just this difference that gives you need a fast shutter speed (although the focal length of the lens you are using. Sep 23, Once the light goes past the lens aperture, it then hits the shutter curtain, which is like a window that is Understand the relationship? Because as the focal length of the lens increases, so do the chances of having a camera.
Click to explore the relationship between the aperture and shutter speed.
When taking photos, one of the first decisions you make with many cameras is which exposure mode to use. As you've seen, your choice determines if you control the aperture or shutter speed. If your camera lets you select them, you can pair a fast shutter speed to let in light for a short time with a large aperture to let in bright light or a slow shutter speed long time with a small aperture dim light. Speaking of exposure only, it doesn't make any difference which combination you use.
Aperture in Photography Defined | B&H Explora
But in other ways, it does make a difference, and it is just this difference that gives you some creative opportunities. Whether you know it or not, you're always balancing camera or subject movement against depth of field because a change in one causes a change in the other.
As you've seen, shutter speeds and apertures each have a standard series of settings called "stops". With shutter speeds, each stop is a second or more, or a fraction of second indicating how long the shutter is open. The stops are arranged so that a change of 1 stop lets in half or twice the light of the next setting.
This table shows the field-of-view of common focal lengths with full-frame, APS-C and micro four-thirds cameras.
The next points explore the relationship between field-of-view and composition. Wide-angle lenses are lenses of inclusion You can think of any lens with a field-of-view wider than around 63 degrees as being a wide-angle. Wide-angle lenses have two characteristics that affect composition: The wide field-of-view means that you have to move in close to your subject to fill the frame.
But, at the same time wide-angle lenses also include quite a bit of the background. The shorter the focal length, the closer you need to get, and the more background is included.
- 4 Things You Should Know About Focal Length and Composition
These two factors combine to make wide-angle lenses, ones of inclusion. You can always fit more into the frame with a wide-angle lens, no matter how close you get to your subject. The background is also more likely to appear more in focus, than it is with longer focal lengths. Getting in close, creates the dramatic perspective that some photographers love. It emphasizes line, and creates a sense of depth, that images taken with longer focal lengths can lack. The shorter the focal length, the more this applies.
As wide-angle lenses include so much background it can be difficult to simplify the composition and remove all distractions. This photo, taken with an 18mm lens APS-Cincludes the buildings, the city wall, the reflection in the water, the city trees disappearing into the distance, and keeps everything in sharp focus. Telephoto lenses are lenses of exclusion A telephoto lens is one that has a field-of-view of around 30 degrees or less. Telephoto lenses are ones of exclusion.
They have a narrow field-of-view. It is also easy to throw the background out of focus by using a wide aperture, and making sure there is sufficient distance between your subject and the background. There is not much in the background at all. Normal lenses occupy the middle ground Normal lenses, those with a field-of-view somewhere around 55 degrees, occupy the middle ground between wide-angle and telephoto.
Understanding Exposure, Part 2: Aperture
If you have a normal prime lens you can open the aperture up to defocus the background, sometimes quite dramatically if you get close enough to the subject.
But, you can also often stop down enough to get everything within the frame in focus. I took this photo with a 35mm lens, a normal lens on an APS-C camera. It lacks the dramatic perspective, and wide field-of-view of the photos taken with wide-angle lenses. But it includes more of the background and shows less compression than the photos taken with telephoto lenses.