WHAT IT WIDE LENS

Wide lens (or wideangle) as the name commonly referred to as the lens (angle) wide. The meaning of the width means it can cover a wide angle image so that the lens can include large areas in one area of ​​the photo. Focal lens is arguably the width is between 10-30mm, while 10mm had entered below grade fish eye. If you use the kit lens with a focal range of 18-55mm (which would be equivalent to 28-85mm due to the crop factor) may feel less so if the lens is wide. So for the needs of a more wide, people then consider having another one wideangle lens.

In this discussion basically distinguish between fixed and zoom wide-angle lens, but we would prefer a zoom lens. So that I demonstrated some wide zoom lens products are quite popular such as:

     Tokina 11-16mm f/2.8 DX
     Sigma 10-20mm f/3.5 EX DC HSM
     Canon EF-S 10-22mm f/3.5-4.5 USM
     Nikon AF-S 10-24mm f/3.5-4.5 DX

The first you need to know about lenses like the above is its price could be even more expensive than the price of the camera: (. Though not always the lens wide variety crammed with modern features such as a stabilizer. Problems aperture openings were generally not a great or constant. Then what's so making it expensive wide lens? perhaps the answer because of the difficulty in designing a more wide lens optics. wide lens optics must be able to provide good sharpness and wherever possible avoid purple fringing and vignetting (darker corners area).

Generally DSLR we have is bersensor APS-C. When you buy a wide-angle lens (ie a lens with a focal 10-22mm) do not like it with a 10mm focal, because due to the crop factor the 10mm equivalent of 15mm if it be compared with film cameras. So, avoid wide-angle lens for full frame like the 14-24mm because it will be less wide
Okay, let's leave the dizzying technical discussion, we discuss aspects of photography alone. What is the purpose you buy a wide lens? If the survey is likely the majority will tell you to get a photograph of a landscape, perhaps for the rest of the interior or architectural photos. Okay, that's part of the function of a wide lens.
But for more details, I can further detail here:

Wideangle not just incorporate many elements into the picture
 Sometimes we think it's useful wide-angle lens to include as many elements into an area of ​​the photo. No one did, because thanks to the wide angle lens so wide it could do that. But in photography it needs a name Point of Interest and get a POI from wide-angle lens is more difficult because if we are not careful then the image that we produce is less interesting as an example of the photo above. Why? Because there may be no undue element, just get into the frame and interfere with POI. So with a wide lens, we need to better understand the basic of photography such as composition, framing, POI, etc.

Wideangle dimension suggests
Wide-angle lens has another feature that is able to give dimension or depth of a photograph. So the function of a wide lens is trying to bring three-dimensional atmosphere in the second dimension. How can that be? Since the photo was made with a wide-angle lens will easily be imagined where the front (close to the camera), which is central and what is the back (away from the camera). As the risk is, objects that are too close to the camera will appear huge, while distant objects would appear very small. I took the photo above on the south coast of Banten, called the Cape Screen. Notice the large rock that resembles coral, the original stone was very large. But because I use a wide-angle lens, so it looked a bit small coral and rocks in front of (the original is quite small) so it seems great. 

Wideangle create distortion effects
It is a commonplace of a wide-angle lens, the distortion. That is at the center of the lens may be fine, but on the edge of distortion so that there will be certain photographs will look less natural, such as portraits and photographs of the building. Another case for the scenery (landscape) where the distortion that occurs can be considered disruptive. Distortions in the architecture will look at the straight lines so skewed, we generally let alone photographing tall buildings in a standing position on the ground. So that seemed the building would appear to get smaller over alias perspective changed. Photo Bani Umar mosque in Tangerang I took with 12mm focal lens (equivalent to 18mm on a full frame), seems so skewed due to lens distortion. To overcome if it can be corrected with the use of digital plug-in perspective correction in Photoshop, or you might as well buy a Tilt Shift lens PC (Perspective Correction)

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