Stopping Down
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Stopping down
Techniques Glossary Stopping down
Decreasing the size of the lens opening (aperture); for example, from f/8 to f/11. This increases the depth of field in a photograph, but a longer exposure is required.
Stopping Down
Stopping Down is the jargon-term for reducing your exposure value by a given number of f-stops (i.e. stopping down two stops or 1 1/3 stops).
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Stopping Down Changing the lens aperture to a smaller opening; for example, from f/8 to f/11.
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Stopping Down
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.
stopping down:
In photography, this is the process used to decrease the size of aperture in a lens.
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STOPPING DOWN - Reducing aperture size - for example, from ƒ/16 to ƒ/22.
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Stopping down further than f16 will enlarge the depth-of-field but reduce the sharpness/contrast in the focus-plane.
Stopping down a lens greatly reduces spherical aberration and coma. It has a small effect on the effects of astigmatism and field curvature, little or no effect on chromatic aberration and no effect on distortion.
Stopping down the aperture can only bring so many things into better focus, but it works quite well in controlled environments, such as shooting products.
Stopping down:
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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Stopping down a Canon EF lens
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This shift in focus may be reduced by stopping down the lens; however, this is not always possible because you may need fast shutter speeds.
Not all aberrations are reduced by stopping down, however, so actual sharpness may be slightly less than predicted by DOF formulas.
Diffraction is ignored.
I shot the same subjects wide open with all three lenses as well as stopping down to f-11 and everything in between. I didn't go any slower than f-11 since telephoto lenses are rarely used at small f-stops.
The problem with that in macro photography is that stopping down the lens limits the amount of light coming into the camera, which can cause problems with lighting.
Distortion cannot be improved by stopping down the lens. Even if the other possible aberrations were totally eliminated, images could result that still have a distorted appearance.
Conventional wisdom is that one can achieve a sharper image by stopping down to a smaller aperture, but this misses the mark in two fundamental ways. First, the image will always be sharp at the point of focus.
If stopping down the lens to f16 creates a situation where the shutter is slow, you need to realize how it will impact the image. If the subject is moving, it may produce a blur.
We should also mention that the GX100 actually produces the highest resolution wide open - stopping down the aperture even a stop or two causes a slight loss of resolution; by the time you get to F5.
Simultaneously to the aperture stopping down, or following it, depending upon the exact mechanical specifications of the SLR used, the mirror you had been using to look through the lens with swings out of the way of the shutter and film.
Distortion cannot be corrected by stopping down the lens. It can be improved by the optical combination of positive and negative lens elements. Find out more.
So after a few shots fighting the lack of depth of field, I decided to work with the lack of light and try some long exposures, sticking my camera on aperture priority and stopping down to f22.
Spherical aberration
A lens fault which causes loss of image definition at the image plane. Its affects are reduced by stopping down.
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Imagine a deer in a field in front of a background of overlapping hills. Stopping down to a small aperture with a shorter tele (100-200mm) will compress and define those lines; converting to b&w will emphasize the repetition still more.
Usually more sensitivity will be achieved by stopping down the aperture somewhat as reduction in illumination is more than offset by a reduction in the circle of confusion (ie less light but more tightly imaged).
Closing down the size of the lens aperture is often referred to as "stopping down" the lens. Jump to Top Back to Previous Page
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If it doesn't focus properly, you may have gotten one of the groups fitted the wrong way around; if it's sticky stopping down, you may have contaminated your aperture blades with dust, hair or something else.
This model is very good value for the performance you get. Used with the prime lens wide open, images looked a tad soft and lacking in contrast, especially in the corners but quality improved with stopping down.
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It was this requirement that created the challenge. Normally, one would consider stopping down the lens to a very small aperture in order to increase the depth of field. However, this solution had a number of problems.
Wide-angle lenses also offer the added benefit of extensive depth-of-field. By stopping down to f/16 or f/22, everything will come out sharp from less than a metre in front of the camera to infinity.
and post-process to choose the desired histogram from the full dynamic range of the original capture (usually 12 bits, IIRC, or 4 full extra stops!). These extra stops are at the "bottom", so they're "underexposed" (the equivalent of stopping down).
A vertical composition to take in some of the bikes, a wider angle, a bit of panning (by stopping down even more to slow the shutter speed enough to add motion blur) would really make this image spring to life.
is that by varying the aperture the photographer can control how much will appear in focus in addition to what is seen in focus through the viewfinder in the finished photograph. Aperture settings are also called f stops. The term "stopping down" ...
 See also: Lens, Aperture, Image, Camera, Light
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