Lens Aperture- the lens aperture (hole or opening) determines how much light will enter the camera. The bigger the aperture, the more light gets in (similar to a window - the bigger it is, the more light it lets in).
Lens Aperture
The aperture is simply the size of the opening that allows light to go through the lens. It is expressed in f/stops (also referred to as f/value
or aperture value), and a typical aperture range is f/2.
lens aperture
the adjustable opening in the iris diaphragm of a camera that determines the amount of light that will pass through the lens during exposure.
Lens aperture
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Automatically set from 1/60 sec to the camera's maximum X-sync speed.
Lens aperture. The lens opening, or iris, that admits light to the film or sensor. The size of the lens aperture is usually measured in f-stops. See also f-stop, diaphragm, and iris.
Lens aperture (f/)
The physical opening of a lens. The smaller the f/number the more light passes through.
Lens apertures are described as numbered f/stops; the f/stops designated with smaller numbers (f/2.8, for example) let in the most light, and higher-numbered stops (f/22) let in the least amount of light.
The lens apertures (referred to as f-stops) are the result of dividing the focal length over the actual diameter of the lens aperture, therefore a useful reference to the amount of light hitting your film or image sensor.
The lens aperture is usually specified as an f-number, the ratio of focal length to effective aperture diameter. A lens typically has a set of marked "f-stops" that the f-number can be set to.
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Controlling Lens Aperture, Shutter Speed, and Depth of Field
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The Depth of Field Preview Button ...
Maximum Lens Aperture: All lenses have an aperture built into them. This is the opening through which light enters the camera to record an image on the digital sensor.
Changing the lens aperture to a smaller opening; for example, from f/8 to f/11. Some lenses, like PC lens or attachment with a none dedicated bellow on macro photography, stop down exposure metering is required for correct reading.
Adjusted with lens aperture ring
Controls the action of the AE-L/AF-L button
Allow the aperture to be selected using the aperture ring on a lens rather than the sub command dial ...
Click-stops - lens aperture controls using a series of bearings that click audibly into place at each numbered setting.
Clip test - short sample of film, cut from the main exposed roll, used to determine the appropriate development and/or fixing time.
The shape of the lens aperture can affect the photo, too. Specular highlights such as streetlights in nighttime are a good way to illustrate this. If you throw the lights slightly out of focus, they take the shape of the aperture.
Similarly, smaller lens apertures (lens with smaller diameters) and shorter lens lengths both create more broad depths of field.
I was using a small lens aperture, f/22, to keep all this detail in sharp focus from front to back, which naturally gave shutter speeds of around a second under the lighting conditions, and resulted in a pleasing blur to the waterfall.
Used to hold an automatically controlled shutter speed and/or lens aperture, in case you need to recompose your picture but want to retain an previous exposure reading.
Top of Page AF-I (Nikon)
Lens with built-in autofocus drive motor.
Depth of field varies with lens aperture, focal length, and camera-to-subject distance. Depth of focus The focal length of a lens system to maintain a precise image size.
diaphragm, the effectiveness of the f/stop of the indicated exposure should be determined Remember, the marked f/stops of a lens that is set beyond one focal length are not valid because the f/stops are a ratio of the diameter of the lens aperture to ...
the lens aperture is set to the chosen value
the shutter is released and film frame is exposed to the light coming through lens. Most modern SLR's use multi-blade vertically travelling shutters that have two curtains.
You can control depth-of-field by changing the lens aperture. Larger apertures (smaller numbers) give shallower depth-of-field which soften the background and the foreground (above picture). Smaller apertures (larger numbers) give greater sharpness.
F-number (See also: Aperture) The set of numbers on the lens aperture ring indicating the relative size of the lens aperture opening.
when the photographer presses the shutter release, the lens aperture is stopped down to the taking aperture of f/8. On old-style camera/lens interfaces (e.g., Nikon, Hasselblad), this is accomplished by moving a lever.
The smaller the size of the lens aperture (the larger the f-number), the greater the depth of field. The larger the aperture, the shallower the depth of field.
Camera-to-subject distance.
A system through which either the shutter speed or the lens aperture (semi-auto) or both (fully auto) are set automatically from the light meter.
Exposure compensation for available light is activated by changing the shutter speed and/or lens aperture. This is done by using AE L AF-L (Auto Exposure/Autofocus Lock) button or exposure compensation button, or by Auto Exposure Bracketing .
Numbers on the lens aperture ring and the camera's LCD (where applicable) that indicate the size of lens aperture. The lower the number the larger the aperture. As the scale rises, each number is multiplied by a factor of 1.4. Standard numbers are 1.
The DOF varies with the lens aperture, focal length and distance to subject.
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A metering mode in which the photographer sets the desired lens aperture (f-stop) and the camera in turn automatically sets the appropriate shutter speed to match the scene being recorded.
For any particular focal length lens and distance the lens is focused on, the determinant of the depth of field is the size of the lens aperture (opening), measured by the f-stop.
The classic way to extend depth of field is to take images using a narrow lens aperture. This solution has two serious disadvantages.
An auto-exposure mode where you select the required lens aperture and the camera sets the necessary shutter speed, to give the correct exposure based on the auto meter reading.
Exposure Compensation Settings used to modify the shutter speed and/or lens aperture recommended by the camera's light meter. Often used to produce special creative effects or to meet the scene requirements.
8, 2 and 4 represent very wide lens apertures, while f-stops of 16 and 22 represent very narrow lens apertures.
Continuously adjustable lens aperture consisting of interposed metal leaves. Adjustment is made by moving the aperture ring on the lens barrel.
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Slow shutter speeds may allow small lens apertures, giving greater depth-of-field, whereas high speeds can be used with large apertures - for separating a subject from an out-of-focus background.
For more on shutter speeds, see exposure.
Automatic Diaphragm: A lens aperture that stays at it's widest opening until the moment of exposure, when it closes down to the aperture at which it is set. After the exposure, it returns to the widest setting again.
Stopping Down
Changing the lens aperture to a smaller opening; for example, from f/8 to f/11.
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Thin Negative
A negative that is underexposed or underdeveloped (or both). A thin negative appears less dense than a normal negative.
A button or lever on the camera that either stops the lens aperture down manually or electronically. This enables you to view the image at the aperture that will be used to take the picture.
The shutter prevents light from reaching the film until the moment of exposure, when it opens for a predetermined time allowing light passing through the lens aperture to reach the film.
To prevent the result from being overexposed, you should then stop down the lens aperture by roughly another 1/2 stop.
with the D100, but newer bodies have gone down as low as ISO 100, something I prefer since it can be difficult at ISO 200 getting shutter speeds slow enough to blur waterfalls in broad daylight, no matter how much you stop down the lens aperture.
The longer the lens was open and the wider the lens aperture, the brighter the resulting picture will be. Every photo editing program will have a Brightness control.
-Automatic aperture - lens aperture mechanism that stops down to s preset size just as the shutter is fired, afterwards returning to the maximum aperture again for focusing and composing the next image.
Stop down. To decrease the size f the lens aperture. The opposite of open up.
Strobe. See Electronic flash.
Sync (or synchronization cord). an electrical wire that links a flash unit to a camera' shutter release mechanism.
Open up. To increase the size of the lens aperture. The opposite of stop down.
Operating system. The program that controls the camera’s or computer’s hardware.
Optical viewfinder. See Viewfinder.
ƒ-stop - (f-stop or F/stop) A lens aperture setting calibrated to an f-number (see above).
FALLOFF - Decrease in the intensity of light as it spreads out from the source.
Maximum apertures are measured in f/stop numbers, which are actually a ratio of the size of the lens aperture and focal length. The smaller the f/stop number, the more light is let in.
The quantity of light allowed to act on a photographic material; the lens aperture controls intensity or amount of light, and the shutter speed (or the enlarger timer in printing) controls the time.
(See Aperture, Shutter speed & Over exposed ) ...
reducing the size of the lens aperture and thus the amount of light passing into the camera. It increases depth of field.
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Each of these numbers correlates to a specific lens aperture size, or f-stop. F-stop numbers are fractions that tell you the exact diameter of the aperture at a given f-stop setting.
Set your shutter speed to 1/60, and set the lens aperture to its widest setting -- or the smallest number. Begin taking pictures and adjust the exposure until you achieve a picture that captures the mood of the club.
If the background is far enough away (well outside the depth of field) and the subject if fairly close (well inside the hyperfocal distance) the degree of blurring is related to the absolute physical size of the lens aperture. For a 56mm f5.
14. F-stop: The number assigned to a particular lens aperture (or opening) size.
15. Film: A piece of plastic with a light sensitive mixture spread on it.
When a picture is taken, light (hopefully focused light) falls on the film in an amount determined by the lens aperture and camera's shutter duration.
Dedicated flash units automatically set the proper flash sync speed and lens aperture, and electronic sensors within the camera automatically control exposure by regulating the amount of light from the flash.
In this video we will show you a simple camera technique that will help you produce a deep depth of field, even when shooting with mid to wide lens apertures. Called "focus stacking", it's a technique that every photographer should be aware of.
The range of distance in a scene that appears to be in focus and will be reproduced as being acceptably sharp in an image. Depth of field is controlled by the lens aperture, ...
 See also: Lens, Aperture, Camera, Photograph, Light
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