online photography courses

Course Number 1 of online photography courses : Lens Types

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 The following are the most common targets are in the market for amateur and professional use. You can add to your existing kit lens some time, is the definition of objectives and key options to consider when searching...

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Telephoto lenses (200m, 500m, 1000mm)

online photography courses -- The lens focal length telephoto produce larger images of distant objects than shorter focal length lenses or regular glasses. Require the additional extension to place farther from the plane of the film. Most of the extension or length greater the magnification..online photography courses....

This extension is not a problem with the camera stand, but with portable cameras or hand power. The lenses are large and bulky, are unbalanced and difficult to use in the hand and it is virtually impossible to eliminate the hand movements and the movement of the trigger.....online photography courses..

The telephoto lens gives a very shallow depth and often it is not corrected for subjects closer to 5-10 meters field. Therefore, it is excellent to choose distant prospect practically less detail, and emphasis around. The telephoto lens is capable of compressing the scenes . online photography courses....

Tele Converters, an extension tube that contains the optical components are manufactured for use between the lens and body. They are cheaper than a telephoto lens, but the image quality is generally poor. Common telephoto is the size of 200 mm, and of course, cheaper... online photography courses..

Wide-angle lenses (18mm, 20mm, 28mm, 35mm)

A wide angle lens or short focal length lenses produce images more broad views longer focal lenses or regular glasses.online photography courses!!

Problems with wide angle lenses distort perspective and are rough around the lens to subject distance. Lines converge and diverge and closing themes are out of proportion. online photography courses !!

In addition, due to the wide viewing angle that is prone to aberrations in extreme lighting conditions. Wide angle lenses are provided with umbrellas to help overcome the light rays of short duration. These aberrations are lens flare and corner fall.!! online photography courses..

online photography courses -- Wide-angle lenses are useful when the camera requires short depth of field and maximum. 28 mm is generally what most people choose to go larger and more expensive. The more expensive the next lens, fisheye. online photography courses ..

Fish eye (220 ° 6mm, 14mm 180o)

online photography courses -- Correcting distortion fisheye sacrifices maximum linear angle for viewing. The depth of field is very wide and very good definition. Fish Eyes produced for scientific purposes, the total picture for heaven meteorology. Most of them are used to dramatic distortions of commercial imagery. online photography courses ::

High cost and limited applications means that these lenses are usually hired and can not be bought.

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Macro lenses

online photography courses -- Macro is a general term that applies to lenses close-up photography - the conditions under which the image is larger than the object. They are usually short-term and proper attention away from the subject.

online photography courses -- Avoid using macro lenses in its smallest opening. The very high effective f / can lead to a degradation of the image due to refraction.. online photography courses.

Tubes and bellows extensions are available to extend the scope of the macro lens. Macro lenses are also a costly endeavor, so choose carefully.

Telephoto lens (80-220mm, 35-120mm)

online photography courses -- Zooms combine the basic shapes of several lenses in one lens. For a lens to achieve this requires a complex optical system comprising multiple elements. Zooms are generally acquired to replace a wide range of lenses and are especially useful for travel.

Zooms are generally longer length that has the problem with this zoom range. Also because of additional elements in the design of the lens, the quality suffers... : online photography courses ::

This objective is the most popular these days and usually within the kit offrered to buy a camera. As it is a common goal, which is quite cheap, however, that the telephoto, the more the more expensive lens.

Soft focus lenses (120mm portrait lens)

online photography courses -- Lens is blurred light spot in the form of a circular patch of light with a core of higher intensity. Therefore, different from a blurred image. The effect is a halo of soft light or contour.

Lens soft focus are generally of high quality and have a history of use in portrait, fashion, glamor and boudoir photography recently.

Soft focus can also be achieved through filters blur. These lenses are very expensive and usually purchased by professional photographers who do a lot of glamor and fashion with working models.

lenses process

Or copy process Lenses are designed specifically for the working copy. Is essential for these lenses have a field of vision without distortion (flat), uniform illumination and a high degree of color correction.

Process lenses are not required to cover a wide range and do not have to be very open. Maximum aperture is often f / 8 and the field of view is usually a ratio of 1:1.

Mirror lenses (500 mm, 1000 mm)

online photography courses -- Unlike the mirror above, since it is a system that reflects and optics. Mirror lenses are recognized by their central element before opaque shaped drum feature.

Mirror lenses are very popular focal lengths for small cameras as they are considerably smaller than their optical counterparts. Mirror lenses are less expensive than long optical lenses.

The problems are that these lenses suffer from aberrations and can not focus on close subjects (1000mm min 30 m) and the speed of the lens is slow (f/10.5)

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