Secrets of lens hoods Explained

You must have seen a flower like contraption in front of many fixed telephoto lenses. Sometimes u find it on normal lenses also, what do they do? If you had a chance to see a professional film camera at work, he had been a device like an elephant ear attached to the front of the camera, which are called matte box.

Lens Hoods

The main purpose of these devices is to prevent glare and lens flares. Now, coming to slowhoods, again, there are several variations. The basic variant is similar to a lampshade, which are used on lenses that work in the highest parts of the region telephoto zoom, because the viewing angle is restricted to these regions is usually cause vignetting blocking the visual field of the lens. Now a days, we have goals that can range from wide to telephoto regions. When using such an objective, we can not use normal because the hood, they will cause vignetting bycoming into the field of view of the lens.

Design Considerations

This problem is solved by using specially designed hood that are designed taking into account the vertical and horizontal viewing angle separately. Usually, the horizontal viewing angle is larger than the sun and the vertical angle from the vertical. This requires a design that is more like a petal or a flower. The hood for each lens must be designed with dueinto account the angles of the lens to prevent vignetting. Hood also serve to protect the lens from physical damage. Some Hood prosumer camera models have a supply of filters or fixed focal length multipliers on them. In the world of macro photography, shorter hoods are available that have rings of LEDs attached to them to enable a proper illumination of the subject at close range. These hoods are extremelyversatile and provide a better degree of freedom for the photographer. You may have your battery packs etc built on them, this can sometimes make the camera a bit 'more front heavy affecting stability.

Matte Box

These are used mainly in the segments of video stills in the segment, because they give the possibility to adjust the length of the fins. The fins are called French flags and the ability to adjust the French flags give them a greater degree of freedom andflexibility. They are used in still photography, but also less visible and are mostly confined to controlled environments like a studio, this is mainly due to the large size of the matte box. They also serve the purpose of providing a place to repair glass or plastic filters. matte box is used more in the video segment, because most are shot in controlled environments. matte box are sometimes made by the same photographer to suite their needs. There are production companiesthey also and above all, no camera or lens, as employees, have adjustable components.

A hybrid of the two has been developed that has controlled the petals on the hood, but did not do too well and went out of business now.

So when buying a lens for your digital SLR, you should buy because its hood, it gives you an advantage when shooting in direct sunlight. It will give you better contrast and yourPhotos will be more lively hood when you use it, prevents the angle of sunlight falling on 's your front lens elements. The picture below should explain it better.

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Digital Camera and Photography Terms Explained

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Want to buy a new digital camera, but I wonder what all these strange abbreviations and terms are and what they mean? Here are a few that I tried to explain in a simple manner.

AE Lock. This means exposure lock, and means that you can point to your argument, get a reading light, then swing the camera to set the picture, while this approach.

Aperture. Size of variable aperture of the lens which controls theamount of light passing through the lens to the sensor (CCD) and is usually expressed as f / number.The higher the f / number the smaller gap and lower the f / number is the greatest ' opening. also controls the depth of field.

Aperture Priority. This is a semi-manual approach in some cameras. The user sets the aperture for depth of field you want and the camera sets the shutter speed for correct exposure.

Auto Focus. Most digital cameras have aauto-focus mode that focuses the lens

Battery. Cameras are equipped with various types of batteries that power the camera. Each manufacturer tends to have their own variation on this and the batteries are not usually interchangeable between the cameras.

Bracketing. Bracketing shots where he is a photographer for the shots of the same scene three times or more at various exhibits. This can be done automatically on some cameras.

Card reader. A device that is used to connect thecomputer memory card

CCD or Charged Coupled Device. This refers to the chip inside the camera that is used to record the image information (on a digital camera is not the film).
The light hits the CCD when a photo is taken, then the analog CCD converts the information to digital.

Contrast. This is the difference between the lightest and darkest areas of a photo.

Depth of field. The distance between the nearest point and farthest point, thatis sharp and in focus. This varies with aperture setting. A small aperture will give more depth of field of a large opening.

Digital zoom. Some cameras will provide digital zoom which really means that "zoom" in the middle of the image and enlarges the pixels. This causes the "noise" or low resolution. The optical zoom is far superior.

DPI Dots per inch. Printers define the sharpness of an image by DPI. A figure of 1200 dpi or higher is required to printphotographs.

Exposure. The exhibition is a combination of how long the shutter is open and how the opening is wide.

EXIF. The exchangeable image file. This is used by cameras to record the data of a hit as the date, time taken, exposure etc. that can be read at times the camera or in software. This is useful to know what was happening when a photo was taken.

Exposure control. Check the settings of exposure through the shutter speed and aperture is important for seriousphotographers. cheapest digital cameras only shoot in automatic mode. If you think you might want to take photography more seriously at some point this should be considered.

Focal length length.Focal describes the magnification of the lens. The greater the focal length, the greater the magnification.

F-Stop (of / or number of stops). The size of the iris that allows light into the camera

Histogram.A histogram is a graph showing the imagetones or a graph of brightness. It can be used to control the exposure of a shot to see if you need to adjust and shoot again.

JPEG (Joint Photographic Experts Group). A format that allows the camera to squeeze a large picture in a small amount of memory. This is the most common system used by digital cameras

LCD Liquid Crystal Display. Most digital cameras have a screen on the back of the camera that can be used for viewing pictures, or sometimes as aviewfinder. A heavy user of battery power!

Macro.This is the camera mode to take close-ups.

manual mode. This is on the high-end cameras and is used by advanced photographers as it gives full control of shutter speed and aperture.

Megapixel. This is a million pixels and able to describe the ability of the sensor. Megapixel define the quality of your image. More megapixels means a clearer picture and sharper or that can be enlarged without losingquality.

Card.The majority of memory to store images taken on digital camera memory cards that can be removed and images transferred to your computer. The cards come in various shapes and sizes but they all do the same work.

Memory Stick. Memory Stick is a removable flash memory card format, launched by Sony in October 1998 and is also used generally to describe the whole family of Memory Sticks.

Optical zoom. This is a true zoom it approaches the subject withoutNavigation with image magnification. E 'preferable and superior to digital zoom. It is advisable to arrive at least 3x optical zoom.

Pictbridge. PictBridge is a technology standard that allows direct transfer of images from a camera to a compatible printer, bypassing the computer.

Pixels. A pixel, ie element, is the basic component or block the construction of a digital image and can have color and tone.
There may be several million "building blocks" in aimage.

RAW. The name is to identify virtually raw data (did not have the internal processing by the camera) image file format.

Resolution. Expressed as a measure of image size or pixels (megapixels) or dots per inch on size of a printed image that there are more pixels in the image will be a sharper image. This is usually referred to as, for example, 1200 x 1800, which relates height and width.

Priority. This is a semi-manual mode and the opposite ofaperture priority.
The photographer selects the shutter speed and the camera sets the correct aperture for the conditions.
Useful for action shots or the need to blur shots.

SLR. Single Lens Reflex is a camera that has a mirror that reflects the image and then on a pentaprism viewfinder screen. This means that you see what the camera sees and is useful for accurately frame your shots.
The mirror reflected out of the way when you takethe image.

Secure Digital (SD) is a flash memory card format developed for use in portable devices.

CCD.An sensor or computer chip, which contains light or light-sensitive pixels and recording the image when you take a picture.

Shutter speed. The shutter speed as it opens and close the passage of light onto the sensor. E 'ie1/60 expressed as a fraction of a second, 1 / 250

TIFF Tagged Image File Format. TIFF is a format of image file that does not lose anyquality when it is saved and compressed.

Tripod. If you are taking pictures of landscape or portrait of a tripod is essential for clear, sharp images in order to reduce camera shake and image blur.

USB. Universal Serial Bus. This is a standard interface on all computer accessories that can be connected to the computer while it is on.

I hope this is helpful!

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