Beginners Guide to Aperture

Beginners Guide to Aperture

Aperture

Camera Aperture is quite simply a hole. It is an adjustable hole. The adjustments are normally 1 stop increments. For example f/2.8 is double the size of f/5.6. Because the aperture is double the size, it lets twice as much light onto the sensor. This can result in a brighter image (1 stop brighter) or a faster shutter speed to achieve the same brightness. The shutter speed would be twice as fast (1 stop) in this case.

Apertures

Large apertures

Why would I pick f/2.8 over f/5.6?

Choosing f/2.8 will help you in a low light situation when you have to hold the camera by hand. The shutter will be twice as fast as the f/5.6.

Cat portrait shallow DOF

Cat portrait at f/2.8 creating a shallow DOF

Cat Portrait

Shooting this cat portrait at f/2.8 is not so much about reducing the shutter speed as creating a shallow Depth of Field (DOF). The eyes are in focus (focal plane), but the detail starts to get blurred on his nose (in front of the focal plane) and even more on his right ear (behind the focal plane). The Depth of field just about covers his face. This can be desirable for a number of reasons. It gives the images a sense of depth and it draws the viewers attention to the important part of the portrait – the eyes. Because of the blur on his right ear, you can sense that his left ear is slightly forward.

Small apertures

Why would I shoot with small apertures like f/22?

The smaller apertures let in less light which means slower shutter speeds, so they typically require a tripod to work with successfully. The desired effect is that everything in the image appears sharp. There is little or no blur because the DOF covers all objects. This is desirable in a Landscape photograph. As a trade off, nothing is really sharp at f/22, it is to do with being so far from the lens sweet spot (best aperture – with many lenses this is around f/8). Most landscape photographers will actually use f/11-16 and achieve a good DOF. They achieve better sharpness because they are closer to the sweet spot. Some photographers will choose f/22 simply for the slower shutter speed if they want to blur water like a silky waterfall effect. While this is effective, the correct choice would be a Neutral Density (dark) filter and the correct aperture choice regarding DOF.

For a more advanced discussion see my Arguing for Aperture article.

Depth of field illustration.svg
By Diaphragm.svg:
derivative work: BenFrantzDale (talk) – Diaphragm.svg, CC BY-SA 3.0, Link

Depth of Field

Aperture’s effect on blur and DOF. The lens is focused on point 2 creating a sharp point on the sensor (5), but the objects not in the focused plane (1 and 3) are blurred, (circles of confusion). Decreasing the aperture size (bottom diagram) reduces the size of the blur for objects at different distances. When the blurring is imperceptible, all points are within the Depth of Field (DOF).

Aperture choice can be useful to manipulate the shutter speed. Aperture works with ISO and shutter speed to form the exposure triangle. But really your choice of aperture should be a consideration of DOF. DOF is an important key to communicating Depth and for guiding attention through an image.

But… aperture is not the only choice that affects DOF. Focal length (how wide is your lens) affects aperture. A wide angle lens will naturally have a large DOF whereas a long lens will naturally have a shallow DOF. Technically, DOF is the same in both, but it is the distance of the lens to the subject that will contribute to the shape of the DOF.

Ice on the beach at Jökulsárlón, Iceland.

Ice on the beach at Jökulsárlón, Iceland. Aperture f/6.3 for fantastic sharpness in the subject and no need for super sharp background.

Canon 5D - full frame

These are heavy duty cameras. I have used the Canon 5D in all weathers. It has a powerful live-view and sensor.

Canon EF 24mm f/1.4 l

Canon's 24mm Prime L lens was all I used for many years.  It is responsible for over 80% of the photos on icelandaurora Sharp from corner to corner.

Canon EF 135mm f/2L USM

One of Canon's sharpest lenses! The best Landscape Telephoto and great for portraits and wildlife.

How to Photograph the Northern Lights

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A total guide to taking photographs of the Northern lights for Digital Cameras & wide angle lenses. This night photography guide includes camera settings, equipment suggestions and some Northern lights photo examples.

Landscape Photography Beginner Guide

Landscape Photography Beginner Guide

Taking photos of Landscapes is such a cool activity that connects you to the nature and helps you forget negative thoughts. If your photography is good, then your viewers will benefit in the same ways. Here are a few thoughts on what landscape photography is, and how to develop your landscape photography skills.

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