Rangefinder

Rangefinder cameras, as the very name itself suggests possesses a rangefinder and it is a mechanism which enables perfect focusing allowing the photographer to measure the correct focal distance and ensure that the photographs are never out of focus. In a majority of the rangefinder cameras it is found that two distinct images merge into one to produce the final perfect image. The present rangefinder cameras perform two functions together i.e. the focal length is adjusted in both the lens and the rangefinder with the help of a single control centre. The origin of the rangefinder cameras can be traced back in the pagers of history in the 19th century and at that time they were known as ‘telemeters’. However it was only in 2004 that digital technology began to be used in these rangefinder cameras. There are at present only three models of digital rangefinders available in the world and all of them are provided with interchangeable lenses. However these rangefinders are more expensive compared to the digital SLR cameras though they do not provide the live preview function on the LCD display.

Digital rangefinder cameras are found to have certain merits which pose it ahead of the digital SLR cameras. In the absence of the mirror, the wide angle lenses provide appropriate focusing. However it is to be remembered that most rangefinder cameras do not possess zoom facilities though there are exceptions which offer about three varieties of focal lengths to choose from.

It has often been alleged that the digital rangefinder cameras are often unable to prevent the parallax error as the photographer can see the viewfinder at a distance from the lens as a result of which the image may be imperfect. However, with the progress of time and the use of advanced technological tools, rangefinder cameras at present insert a brightline frame into the viewfinder which enables to check the parallax error.

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<a href="http://www.stackians.com/2008/01/22/cool-gadgets/rangefinder-to-measure-the-correct-focal-distance/">Rangefinder to measure the correct focal distance</a>