Focal length and aperture relationship advice

What is the best aperture and focal length for portraits? | TechRadar

focal length and aperture relationship advice

Knowing what the focal length means, especially in relation to your camera, is very important when it comes to buying lenses. Read this post to find out what. It's not just a matter of focal length: which aperture you select is important What is the best aperture for portraits: free photography cheat sheet. If you increase the ISO you can have a smaller aperture and shorter shutter time, Focal length translates into field of view for a given camera.

Depth of field explained | TechRadar

How To Shares If you're just getting started in portrait photography you've probably asked yourself what is the best aperture and focal length? In our cheat sheets below we help answer this question by showing you how changing the aperture and focal length can produce very different effects with your subjects. We'll help you decide if you want your subjects to be separated from, or part of, their surroundings and then get the appropriate focal length for the style of portrait you're planning to take.

There's not necessarily a right or wrong lens to use, but rather the most appropriate for the subject and location.

Rules of Thumb - Finding Your Lens' 'Sweet Spot'

Sometimes you might want to show more of the background around your subject for an environmental portrait, while at others you might want to compress it and blur it to make your subject the supreme focus of attention.

In addition to affecting how much of the background is visible in your shots, different focal lengths will affect the shape and proportions of your subject's faceand can even give a caricature effect.

focal length and aperture relationship advice

While using nice fast, prime lenses is desirable they do come at a cost and it's important to remember that you can achieve stunning results with kit lenses and standard zooms. It's not just a matter of focal length: 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.

4 Things You Should Know About Focal Length and Composition

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. These two factors combine to make wide-angle lenses, ones of inclusion.

Digital Photography ll Aperture's Relationship to Focal Length ll Lecture-10

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.

Rules of Thumb - Finding Your Lens' 'Sweet Spot' | B&H Explora

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.

focal length and aperture relationship advice

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. What is depth of field?

focal length and aperture relationship advice

A camera can only focus its lens at a single point, but there will be an area that stretches in front of and behind this focus point that still appears sharp. This zone is known as the depth of field. It's not a fixed distance, it changes in size and can be described as either 'shallow' where only a narrow zone appears sharp or deep where more of the picture appears sharp.

focal length and aperture relationship advice

Because depth of field has an impact on both the aesthetic and technical quality of a picture. Sometimes you'll want to use an extensive depth of field in order to keep everything sharp. A classic example is when you're photographing a landscape, where generally the most desirable outcome is to capture detail from the foreground to the horizon.

Other times, a shallow depth of field will be preferable. It enables you to blur background and foreground details, causing distractions to melt away and allowing you to direct viewers to the focal point in a picture. Okay, so where do I find the depth of field control on my camera?

Many digital cameras come with a Depth of Field Preview button near the lens mount, or enable you to assign the same function to one of the other buttons.

However, this doesn't have any effect on the depth of field. The image you normally see through the viewfinder or on the Live View screen is displayed at the lens's maximum, or widest, aperture; the aperture you dial in on the camera body will only be set when you take a picture. However, pressing the Depth of Field Preview button allows you to view the scene at the working aperture, so that you can see what areas will appear sharp.

There's a range of ways to control the depth of field - the choice of aperture, focus distance and the type of camera.

focal length and aperture relationship advice

In a nutshell, wider apertures and closer focusing distances lead to a shallower depth of field.