Results in Rangefinder Cameras

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Rangefinder Cameras

A rangefinder camera has a split-image range-finding focusing mechanism that can be used to measure the distance to a subject and take photographs in sharp focus. Most digital cameras and film cameras use electroacoustic or electronic measuring functions with autofocus, but it is not called range-finding.

How it works

Most rangefinder cameras show two images of the same subject. One moves when a calibrated wheel is turned and when the two images coincide, they become one image and the distance can be read off the wheel. Non-coupled rangefinder cameras show the focusing distance which the photographer transfers to the lens focus ring. These types of camera had separate viewfinder and rangefinder windows, while later versions combined the two into one viewfinder. Modern designs have the rangefinder joined with the focusing mechanism so that the lens focuses correctly when the rangefinder image fuses.

Features

The rangefinder camera was manufactured in different sizes and film formats, from 35mm through to medium format roll film and large format press cameras. In older models, folding bellows cameras were fitted with rangefinders.

35mm cameras use focal plane shutters with interchangeable lenses of either screw or bayonet mounted design, but fixed lens leaf-shutter rangefinder cameras were more popular. They had high speed, high quality optics with either manual or automatic aperture capability. Digital technology improved the rangefinder cameras in 2004 using M-mount lenses or earlier screw mount lenses via an adapter.

Advantages and disadvantages

There is a parallax error in the viewfinder which doesn't allow viewing through the lens and is offset from the lens so that the image is not exactly how it will be recorded on the film. It doesn't show at large distances but as the subject is brought nearer, the error becomes more apparent.

Larger lenses could block a portion of the view, as will lens hoods that are used on rangefinder cameras. It can also be difficult to integrate zoom lenses as the design of the rangefinder camera hasn't been adapted to accept this type of lens.

Rangefinder cameras don't have a moving mirror so there are no blackout moments whilst the subject is being photographed. This often makes the camera quieter and less obtrusive to use. When using the viewfinders, photographers may find that the field of view is not much bigger than the lens. This means that the photographer can see outside the frame. Filters that absorb light and change the colour of an image are much easier to compose and focus on a rangefinder camera. However, graduated and polariser filters are better used with an SLR camera.

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