The advantages and weaknesses of the system DSLR cameras: Canon, Nikon, Sony, Pentax and Olympus

Many people are asking what the advantages and disadvantages of a digital SLR camera system. In general, all DSLR cameras is almost the same: a large sensor is larger than a pocket camera / phone, manual and automatic functions. What are distinguishes usually is the design, features and a collection of lenses and accessories.
It's hard to say which system is the best because each of them has advantages and disadvantages. In addition, each model is different and has their own advantages, and also disadvantages, too.
According to my observations during this last two years, I will briefly review some of the uniqueness of the popular DSLR camera system.

canon 1000D

Canon 1000D, currently still be one of the cheapest camera.

Canon: One of the DSLR camera system of the most popular cameras in the world. Canon lens has a complete collection of low-quality to high. The cameras are also a full-camera for beginners to very advance for upscale professionals.
I love the cameras of Canon brand, the beginner cameras compared to other brands such as Canon 1000D, 500D and 550D I think it is easy to use, and the interface and menus are also very neat and well-organized. Lack of Canon beginners’ cameras is the material is rather cheap and not so good when I was handing them in my hand.
The last two years, Canon is more focus in the development of DSLR cameras that can record video clips. Even recently, almost all Canon DSLR cameras surpass its competitors in the affairs of the video recording.

nikon D3s

Nikon D3S, sophisticated camera which photographer’s dream, especially for the event or photo-journalistic event.  

Nikon: Same as Canon, Nikon system can be said quite complete. Nikon have many high-quality lenses and more expensive than Canon’s. I like Nikon cameras particularly the sophisticated one such as (D300s, D700, D3, D7000, D5100) because the auto focus works very well, probably the best compared to other brands. The Control of noise at high ISO is also a class above other brands, making it suitable to be used for photos in a dark room conditions.
Unlike the Canon, I do not much like a beginner cameras of Nikon such as (D40, D60, D3000, D3100) for their inter-face I think is not good. For example the menu structure is less tidy and also the buttons available to access is also less frequently used in settings. In addition, beginners Nikon’s camera has no auto focus motor so that for some long lens, can not use auto focus (manual only).
Sony: Sony is a relatively new entrant, but the technology that uses is Konica Minolta techno which is in the acquisition of Sony several years ago. I can Sony is pretty aggressive and produce a lot of new models every year, but the models are similar for each camera. Sony also has a row of camera’s models from the beginners through professionals, even, for the professionals cam which are not as sophisticated and as much as Canon and Nikon.

Sony Nex-5 & Nex-3

Sony Nex-5, is camera which is similar to SLR that Sony developed this past year

There is some uniqueness in Sony’s cameras compared to Canon and Nikon. For example, there are camera’s features built-in steady shot that helps prevent blurring image due to vibration of our hands (if Canon & Nikon its feature is located on the lens). So many Sony’s cameras also have two sensors so that auto focus during live view mode (such as a pocket camera) is much faster than other brand camera. In addition, many models of Sony’s cameras that have LCD screens that can in turn mode, making it easier for the composition of the photo above the head or under the foot.
In its development, beginners’ cameras of Sony are not so changed on its features, only a few of its design changes. For advanced camera options, Sony does not offer many, A700 and A900, they’ve long enough not be renewed.
On the other hand, Sony is heavily in producing the similar cameras such as DSLR camera, for instances: Sony A55, A33, and Sony Nex-5, Nex-3.
Pentax: Pentax we could say it’s a small player in the field of DSLR camera, but Pentax camera design is actually quite good. Focus Pentax in the last few years is to be different (Be Different). Pentax digital SLR cameras such as km, kx small but sturdy with a feature that is quite competitive. The uniqueness of this camera is use of the universal AAA batteries, so if you run out of batteries, you can be directly purchased at the nearest store. Pentax kx is also available in various colors like white and red.

Pentax colorful kx. Most are only available in Japan

Then Pentax also has K7 and K5, which includes in advanced SLR- camera and the size is not so big, but bear in bad weather, including extremely cold conditions. In system, Pentax lens collection is not as much as the big three (Canon, Nikon, Sony), but Pentax has a lens - a lens prime / fixed a very small and has a high quality such as Pentax 70mm f/2.4, 31mm f/1.4 and so on. Like Sony, all Pentax cameras’ models also have built-in vibration dampers.
Olympus: Olympus DSLR system’s uniqueness lies in the size of the camera and its lens which are relatively smaller and thinner. This is because Olympus uses sensors 4:3 (four thirds), which is smaller than any DSLR above. As its Consequent the maximum image quality from its 4:3 sensors is a bit less, especially at high ISO. However, Olympus photo quality is much better than a pocket camera. Although small, all of the cameras except Olympus E-420 model, also have features built-in vibration dampers.

Olympus E-620

Olympus E-620 including one of the Smallest DSLR

Last year was the year that is less encouraging in the development of Olympus DSLR system. In that year, Olympus announced it will concentrate their selves to the development of micro four thirds (like a digital SLR camera which is smaller) and stop the renewal of the lens for a DSLR.