What is 'Depth of Field' (DOF)? - Definition
There are many beginner photographers and even more experienced ones that still don't quite understand what the meaning of the term 'depth of field' or DOF. I want to provide you a reference from some of the most professional articles ever written on depth of field. In general, the zone of acceptable sharpness is referred to as the depth of field. Many of you probably know that if the aperture decreases , the zone which is out of our focus subject gets shallow depth of field or more blurred and vice versa. So here are some links to many of my favorite articles about depth of field, which I'm sure that you find very interesting. And in the future, when someone asks you about the term depth of field, you will know what it is and can easily explain it to him.
Depth Of Field on Wikipedia - on this Wikipedia depth of field page, you can find an in-depth article about the term DOF. You will become familiar with terms like 'shallow depth of field', 'aperture', 'f-number' and hyperfocal distance. You can see illustrations that will show you why subjects inside the depth of field area appeared sharp and subjects outside the depth of field area appear blurred. Photographers use a shallow depth of field or a lower f-number in order to isolate the subjects from the background. For example, if you want to take a picture of a flower and the flower subject is being distracted by many other flowers in the background, you can focus on this flower and using a smaller f-number, in order to blur the flowers in the background using a shallow depth of field.
Understanding Depth of Field - another interesting tutorial about depth of field and photography, can be found on Cambridge in color website. You will learn why depth of field varies in different camera types and walks variables influence the depth of field (like aperture, focusing distance, camera type etc.). You will learn about rigorous term called the "Circle of confusion", and how is used to define the area that will become unsharp. You will also learn how to control the depth of field using camera lens settings and the connection between focal length and depth of field. You can also calculate the depth of field using the online depth of field calculator (canon depth-of-field calculator). Using the DOF calculator, you can choose your camera type, which actually fill the sensor type or sensor size variable into the equation. You can select aperture size starting from f/1.2 to f/64, choose the actual focal length and focus distance to the subject, and click calculate to get the total depth of field.
Depth of field and diffraction - this article from Norman Koren photography page, will teach you about depth of field and diffraction. This article is not intended for beginners, because its really explaining about depth of field in a mathematical type of explanation. On Norman Koren DOF tutorial, you will find basic lens and depth of field equations. You will see how to calculate the sharpness of an image with different circle of confusion. You understand the meaning of MTF also. The DOF tutorial by Norman Koren is followed by examples, which will help you understand every calculation that is being made on the page. You will also learn how to use depth of field scale to find the optimum aperture. You will mathematically find the connection between depth of field and focal length. You will learn about equations for total depth of field, DOF limits, diffraction and four months. Learn about the term "sweet spot" also. Which is commonly known as a specific aperture number or arrange of aperture numbers, which the lens gives its optimum results? I recommend to read this section for professionals and people were interested in learning all the calculations about depth of field is done. Consider that it's not necessary to understand all this information in order to take great photographs.
To blur or not blur? - this article on mir.com.my website, explains about depth of field and how it is used by photographers to get the exact image they want and controlling the output of the image you are taking with their camera and lenses. There are sample images, which illustrate how shallow depth of field looks like. You will learn how depth of field increases with distance, so when you place the camera further from the object that you want to take photograph of, the more depth of field you can gain. It also has a quick reference guide about depth of field that will easily pass you the right information you need to remember and understand when controlling the depth of field using your lenses. This article about DOF is really simpler to understand for new photographers than the previous article about depth of field and diffraction.
Summary
So this is that, just browse and visit those websites and start treating and gain more knowledge. I'm sure that after you finish reading at least two of the articles about DOF, you will surely understand what a depth of field is, and how to use it in order to obtain the rights results using your Karen camera body and lenses. Hope this helps, and will provide you many more links to articles that explains about different turns related to photography. See you on my next post.
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