Leica

35mm F/4 PA-Curtagon- R Lens

For Leica R

This is a special wide-angle lens with parallel displacement to avoid converging verticals. It gives the LEICAFLEX some of the scope of a viewfinder camera with lens displacements and is, therefore, particularly useful for architectural photography and similar applications. It is, in fact, a lens with a built-in "rising front" in any direction.

The optical "secret" behind the PA-CURTAGON-R is that the lens has been corrected to cover a larger angle than required for normal 35mm lenses. With this extra coverage, the optical axis of the lens can be decentered in any direction up to 7mm. You mount it on the camera like any other interchangeable lens; then the front part can be moved up, down or sideways. In this way, the LEICAFLEX can take in tall buildings without having to tilt the camera, while you avoid converging verticals and eliminate undesirable foreground subjects. In effect, it is an ultra-wide angle lens with an even bigger angle than the 28mm ELMAR IT-R; you cover any part of the ultra-wide angle view you want to by laterally moving the lens.

In addition to architectural and industrial photography, this displaceable lens also offers many possibilities for perspective control. The field of view, including the change in the image field obtained by displacing the optical axis, is directly observable through the LEICAFLEX viewfinder. With its focal length of 35mm and an image field of 57mm diameter, the PA-CURTAGON-R has an effective image angle of 78°. The optical system is built into a helical focusing mount to cover distances from infinity to 12", measured from the film plane!