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Class Lecture on Aperture (Basic Photography)

### Transcript of Session 3 Aperture (Photography Class)

• 1. Aperture

2. Prae-Lectio: Aperture Concept of ApertureExposure TriangleWhat is an apertureDepth of Field 3. What is an aperture Aperture Ring The aperture is the hole (opening) in the lens that the light passes through. Apertures available depend on the lens, and are usually changed by rotating a collar on the lens close to the camera. Aperture is the lower ring, the focusing ring is the upper. The larger the aperture number, the smaller the hole and so the less light can get through. 4. Aperture- Achieving the correct exposure is a lot like collecting rain in a bucket. While the rate of rainfall is uncontrollable, three factors remain under your control: the bucket's width, the duration you leave it in the rain, and the quantity of rain you want to collect. - You just need to ensure you don't collect too little ("underexposed"), but that you also don't collect too much ("overexposed").- The key is that there are many different combinations of width, time and quantity that will achieve this. 5. How the Aperture Works 6. Exposure Triangle 7. Aperture 8. Aperture Stops 9. How to Set Your Aperture 10. Desired Opening 11. Apertures 12. Depth of FieldOne of the powerful tools of your lens is the Depth of Field, it can be used to keep things sharp and also isolate something from the background. Take this image as an example, I captured it at a tire "graveyard. The picture really was about a lonely ower among all the tires. This frame was shot at f/11 but at this aperture it was really hard to see the ower. In fact, it was almost hard to make out what I was looking at. 13. Depth of Field In this picture I opened up wide to f/2.4. Notice how the ower in the foreground now are jumping out of the image while it is still possible to see the tires in the background, but now the tires are more of texture and support to the ower. 14. Depth of FieldThe aperture controls the depth of eld in the photograph. When you focus on a particular point, all points that distance from the camera are in focus. Points closer and further away may also be in focus, depending upon the aperture. At narrow apertures, more of a scene is in focus, useful in a landscape where you want the foreground and background in focus. On the other hand, when taking a portrait, using a wide aperture will put the distracting background out of focus, isolating and emphasizing your subject. 15. Depth of FieldLess Depth of Field: With the lens focused on the side of the bench, the aperture of f/1.4 throws just about everything else out of focus. Notice the benches in the distance and the plant in the bottom left corner. A wide aperture is often used in portraiture or whenever a subject needs to stand out from its surroundings.Lots of Depth of Field: An aperture of f/16 results in everything being in focus. Narrow apertures are often used in landscapes to make everything from the foreground to the sky in focus. 16. Aperture Table (f stops)Aperture 2 Remarks Wide, very little depth of eld, some are out focus, with emphasis on something 2.8 4 5.6 8 11 16 22 Narrow, lots of depth of eld, almost all are in focus 17. Apertures 18. Depth of Field A small aperture provided this image with plenty of depth of field, using ISO 400. 19. Play of Light and Shadow A small aperture provided this image with plenty of depth of field, using ISO 400. 20. Aperture: Depth of Field 21. Repetitio: Aperture Concept: A bucket of waterControl the entry of lightHigher Number smaller apertureDepth of FieldSmaller aperture more depth of eld