Lens barrel (side of camera) controls
On the left side of the camera are a set of controls within easy reach of your left thumb. The flash and white balance buttons are hold and turn command dial type, below this is the focus mode switch.
Lens Barrel
A Lens Barrel is the outer casing of a camera lens, having all the manual lens controls on it - f/stop or aperture control, focus ring, and (at times) critical focus marks.
lens flare ...
Lens barrel
A metal or plastic tube with a blackened inner surface, in which the lens elements and mechanical components of the lens are mounted.
Last, the lens barrel has reflected against the inside of the dome (see arrows above). What you see in your photograph is the shiny front rim on your lens. This is typical of some lenses under some lighting conditions.
lens barrel - The tube that contains the lens elements.
lens cap - Hard, protective cover that clips over the front lens element when the lens is not in use.
Photographic lenses are measured according to their focal length which is normally imprinted somewhere on the lens mounting (usually the front surface of the lens barrel).
If you've ever watched Moose closely while he's photographing wildlife with his 400 or 600 you may have noticed his left hand madly moving back and forth on the lens barrel and wondered what that was all about. He's using the M/A mode on the lens.
Lens barrels, particularly the threads to which filters attach, are usually made from aluminum. Filter rings, particularly aluminum ones, can sometimes "bind" to the aluminum lens threads and be difficult to remove.
Some hoods fasten to the very end of the lens barrel by means of a bayonet (rotating and locking) mount and others clip further down the barrel to a small ring by means of small spring-loaded plastic clips in the hood.
My main lens is the EF 100-400mm and the flash is so close to the body that the lens barrel blocks some of the flash.
It's body is somewhere in between the size of those two cameras, though it's lens barrel sticks out a bit further. Probably owing to the fact that larger optics are required to create an image circle that will cover the larger sensor.
The MP-E 65 macro lens has Canon's standard 'macro light' flange on the end of the lens barrel (58mm filter size) for the ring light to clip on. The MP-E 65 has reproduction ratios and focusing distances printed on the lens barrel.
F/stop-A metal plate or diaphragm that controls the amount of light entering a lens barrel. In most cases, the diaphragm is iris shaped. The larger the hole in the diaphragm, the smaller the f/stop number. For instance, f/1.
Fine sand particles can get inside camera bodies and lens barrels and wreak havoc with your camera's mechanics and optics. This is not just a problem when you're taking some pictures down on the beach. It was a major headache in the 1991 U.S.
The Samsung NX200 still uses the innovative iFunction lenses, which enable you to change settings such as aperture and shutter speed, white balance and ISO via the lens barrel.
A conventional double helicoid focusing system requires that all lens groups be moved by the lens barrel to either the front or rear during focusing.
Accordingly, when the lens barrel is fully extended to the shortest focusing distance, resolution is reduced.
Electrostatic flocking techniques: Light rays can also be reflected by the inner lens barrel. Extremely fine pile applied to the surface can absorb these reflections.
e numbers on the lens barrel indicating the size of the aperture relative to the focal length of the lens. f numbers are calculated by dividing the focal length of the lens by the effective diameter of the aperture.
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Check the lens barrel for any dents. do not buy the lens if it has a big dent.
Make sure the focusing ring and the zooming turn smoothly. If they get stuck or show resistance, do not buy the lens. The lens was probably dropped and bent.
The focal length of a lens is usually displayed on the lens barrel. Pictured below is a Nikon lens with a focal length of 50mm. The maximum aperture is f/1.8 (also often written as, F1.8).
Nikon 50mm f/1.8 AF Nikkor ...
Depth of field scale
Scale on a lens barrel showing the near and far limits of depth of field possible when the lens is set at any particular focus and aperture.
These lenses will be designated with the abbreviation IF on the lens barrel. Find out more.Image Authentication Software Verify JPEG, TIFF and NEF (RAW) data taken using a compatible Nikon digital SLR.
There should be no way for dust or dirt to enter the lens barrel and affect the internal elements of the lens. Then use your micro fiber cloth to finish the job. I use the same combination for glass and plastic filters as well.
Unscrew your front aperture guide ring. You can see this when you look down into the front lens barrel; it's held in place with three screws. Undo these and keep them safe.
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Remove the front aperture guide ring.
This prevents the physical length of the lens from changing, or the lens barrel rotating; allows for faster focus, reduces aberrations, and facilitates use of filters that require specific alignment such as polarizers and graduated neutral density.
Compound shutter
A shutter consisting of a number of metal leaves arranged symmetrically around the edge of the lens barrel.
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The number sequence is printed on the lens barrel, each higher f number halves the exposure of the preceding one.
The f-number itself is effectively the number of times the aperture diameter will divide into the lens focal length.
While a little bit is good to avoid hitting your lens barrel when you aim for your subject, a lot is not necessarily better.
For my shot of Castlerigg Stone Circle I used my 24 to 105mm lens at its widest focal length i.e. 24mm. This value can be read off from the top of your lens barrel once you are happy with your composition.
Internal Focusing - Types of lens that have internal components that can be adjusted in order to focus a shot, rather than depending on adjusting the lens barrel.
Internal Memory - See "Memory Buffer." ...
an early form of aperture adjustment in a camera that consists of a metal strip in which a desired size hole is accurately drilled, and the metal strip is inserted in a slot in the process lens barrel to take the place of the usual iris diaphragm.
over you, carry a few locking plastic bags to use as temporary waterproof housings. With a DSLR or zoom camera, just put the camera into the bag, cut a hole for the lens to poke through, and secure the bag to the front rim of the lens barrel with an ...
This auto focus assist light is usually located beside or above the lens barrel. A disadvantage is that it only works up to about 4 or 5 meters.
Otherwise slide an empty plastic film canister in between the foot of the tripod collar and the lens barrel when feasible (like with the 300mm f/4 AF-S).
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While the camera body and the lens barrel can be covered. The photographer must be able to see through the front of the lens in order to set up an image.
 See also: Barrel, Lens, Camera, Light, Focus
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