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Listed below and comment the main features which should be evaluated when choosing a view based on the main characteristic to assess in this field is the size of the sensor: the sensor mount digital cameras of different sizes according to various factors, primary among them is economic. The sensors of digital cameras, in fact, are cut from silicon wafers, with increasing size also increases the potential for defects, as well as decreases the number of pieces that can be drawn. That’s because normally the larger sensors are located on the machines of professional or semiprofessional and then medium-high. To give some examples, the new Canon EOS 1Ds or 5D mount sensors 24×36mm, about the size of the film., While the Canon 20D and Canon Rebel XT (350D) have smaller sensors (corresponding respectively to 2.7 and 22.2 × 15.1 mm × 14.8 mm).
Archive for the ‘How to choose a lens?’ Category
How to choose a lens? Part II
Posted by LENZE on September 9th, 2009
Posted in How to choose a lens? 
Tags: bayonet, Canon lens, choose, EF, filter, focal length, focus, glass, how to buy, lens, size 
Comments OffHow to choose a lens? Part I
Posted by LENZE on September 7th, 2009
To choose a lens, first must understand how it works, right?
Optical glass
The optical glass is made of a fusion of different chemicals such as oxides of barium, tantalum and lanthanum. Each type of optical glass has a refractive index and a power of dispersion. The refractive index indicates the power of the light curve of the glass. The higher this index, the more you change the direction of the oblique light entering the glass. The power of dispersion indicates the ability of glass to divide the white light. So the higher this index, the greater is the spectrum of colors of white light is divided.
