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Lens Properties - Aperture
Category: Lenses
Updated 1 month ago by renan

Aperture - is the hole or opening in a lens system where the rays of light passes through. The size of the opening determines the amount of light that enters the sensor of a camera. It is measured in f/number as a ratio between the focal length of the lens and the diameter of the opening. For a 50mm lens for example, with an opening of 28mm the aperture is 50/28 or f/1.8. This means that a larger f/number will have a smaller opening.

lens aperture

By changing the aperture, photographers are able to control the amount of light that enters the sensor, thus managing the exposure of a photograph.

The aperture in photographic lenses can be varied using a mechanical diaphragm composed of thin sheets of metal that are linked together. It acts like an iris in the human eye. The opening can be varied within fixed values that are a factor of the square root of 2 or 1.414 since this is the ratio between the diameter of a hole and the diameter of the resulting hole if you double its area. The increase or decrease of the opening using this factor, doubles or halves the amount of light that passes through accordingly. Each step is called a "Stop".

Standard aperture values in most scales are rounded off and are spaced a stop apart: 1.0, 1.4, 2.0, 2.8, 4.0, 5.6, 8, 11, 16, 22, etc. Most digital cameras are able to control the aperture in much finer steps to allow more precise adjustments.

Changing the aperture of a lens not only changes the exposure of a shot, but it also has an interesting effect on "depth of field" which could be controlled to provide artistic options to your photography.

Depth of Field - is described as the range of distance at which the subject is in relatively acceptable focus. This varies depending on the focal length, the distance of the subject and the aperture. At the same distance and focal length, a large aperture will provide a shallow depth of field while a small aperture will make it deeper.

depth of field and aperture
The objects within a photograph that are in front or behind the focused zone will be blurred. The farther away they are from the focused zone, the blurrier they get. The aperture used also determines the size of the spread of each detail of the object. This effect is used intentionally by portrait photographers to provide separation between the subject and the background and make the subject appear to "pop out" of the photograph.

Lens Properties - Focal Length
Updated by renan - 1 month ago


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Camera Basics - Sensors Pt. 1
Photography Basics
Updated by renan - 2 weeks ago
Starting out in photography, everyone has to pass through the most fundamental step of choosing a camera, and with all the brands, and models of cameras this is not easy, especially if this is your first time purchasing one. Let us break these models down into simpler groups and try to see group fits you best.
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Photography Basics
Updated by renan - 2 weeks ago
So, you decided that you're going to take up photography and maybe eventually, make it a regular hobby, or even make money out of it someday. Before all that, let's take a few steps back and try to understand what photography is and what it actually takes to be a photographer.
Camera Basics - Types of Camera
Photography Basics
Updated by renan - 2 weeks ago
When choosing a camera, you need to understand the different types that are available and examine which one fits your style of photography and produce the kind of output that you hope to get.
Lens Properties - Aperture
Updated by renan - 1 month ago
Another important property of a lens is the aperture. This provides photographers with options to control the technical and artistic qualities of a picture by adjusting the front opening of the lens which affects the exposure and depth of field.
Lens Properties - Focal Length
Updated by renan - 1 month ago
Purchasing a camera with a fixed lens or choosing a new lens for your interchangeable lens system could be quite confusing specially with all the different lens properties and misleading specifications laid out by different manufacturers. Understanding the important properties of a lens system is your first step in making a proper decision.


Latest Website Upgrades
Posted by renan - Jun 27, 2018
Several of the planned changes for the website have already been implemented in the past few weeks. Here is a summary of the features and functions that are currently in effect. Your thoughts would be appreciated.
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Every time one laughs a nail is removed from one's coffin.

-- Honduran Proverb

You have forfeited your freedom. Only if you risk are you free.

-- Unknown Author

Chained by your attitude, you are a slave.

-- Unknown Author

You may avoid suffering and sorrow, but you cannot learn, feel, change, grow, love, and live.

-- Unknown Author


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