The excellent image performances are achieved by 6 or 7-element constructions. No cemented surfaces are used, in order to prevent damage resulting from the build-up of heat. The field curvature evens out the film curvature in the projector over the format width of about -0.15mm and ensures a sharp projected picture right into the corners.
Distinctly higher values of the modulation transfer function (MTF) over the complete image field are achieved by special glass selection. The new construction reduces distortion and lateral chromatic aberration considerably. All lens surfaces receive anti-reflection multi-coating in accordance with the latest technological developments. These lenses are available only in 70.6mm barrels.
Our 870 lenses will bring off-the-shelf high-performance lenses to the newly emerging 870 film industry.