Retrofocus lens
Also known as a reverse or inverted telephoto, this lens design has a diverging lens element positioned in front of the aperture and a converging element positioned at the rear.
Retrofocus lens
Techniques Glossary Retrofocus lens
Also known as a reverse or inverted telephoto, this lens design has a diverging lens element positioned in front of the aperture and a converging element positioned at the rear.
Retrofocus SLR Lenses
The SLR cameras most familiar to amateurs need special retrofocus designs to keep the back of the lens away from the swinging SLR mirror.
Retrofocus Design
In a retrofocus design, which is advantageously applied to wideangle lenses, ...
Retrofocus-Type (Wide-Angle) Lens It is a lens which has the principal point behind the rear part of the entire lens. Find out more.Reversal Film Also called positive film or slide film.
The retrofocus lens solves this proximity problem through an asymmetrical design that allows the rear element to be further away from the film plane than its effective focal length would suggest.
Most wideangle lenses from SLR cameras are retrofocus (retro-telephoto) designs, meaning that the nodal point is somewhere towards the front of the lens, in some cases in front of the lens.
Because a rangefinder camera doesn't have a mirror box doesn't need to use retrofocus lenses, meaning they sit much closer to the film (or in this case the sensor).
Thus, a special approach to the lens design is required, known as 'retrofocus design'. It works fine for long lenses, but has a profound negative impact on optical quality of shorter lenses.
It could be somewhere inside the lens, it could be out in front of the first element of the lens (for telephoto lenses) or it could be somewhere between the last element of the lens and the focus (for wideangle retrofocus lenses).
in photography and cinematography, telephoto lenses magnify its subject, render a more narrow angle of view and have smaller depths of field at a given aperture than other lenses. The opposite version of a telephoto lens is known as a retrofocus lens.
have to take pictures of very small objects and if you don't need a large tele-lens. The quality and sharpness of the lenses is (much) higher then of most SLR lenses, even manual-focus, since the G2 lenses do no not need the "retrofocus" ...
 See also: Camera, Focus, Lenses, Lens, Aperture
  
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