| Camera Accessories |
| Ultra Primes
Detailed Information New Optics Floating Elements for outstanding close-up performance Lenses reach their highest performance at the focus setting for which they have been optimized. This is normally infinity. Beneath that the performance usually drops off, particularly through a considerable increase in image area curvature and increasing aperture aberrations. Because of this, most optics manufacturers limit the minimum close-up setting possibility of their lenses to avoid users from moving too far into this area of lesser performance. With the ULTRA PRIME lenses, Carl Zeiss introduced and perfected an effective means against: Floating Elements. This is a design principle in which lens groups move in relation to each other during focusing, thereby correcting image area curvature. This principle must be taken into account not only in the optical design but also in the highly precise construction of the mechanical components. Both were achieved for the new ULTRA PRIME lenses allowing for close-up setting possibilities almost up to the front element of these lenses.
Genuine Internal Focus For sensitive focusing at a constant optical length Conventional lenses change the distance of the entire internal optical assembly relative to the filmplane when focusing. In practice this brings considerable disadvantages, for example through drift of the gears for focus and iris, displacement of the center of gravity, etc.. All these disadvantages are avoided by the ULTRA PRIME lenses: through their genuine internal focus, the external position of the lens remains constant ? for the entire range of focus. Instead of moving the entire internal optical assembly with a large drive mechanism, only small lightweight lens groups in the interior of the lens are moved. This facilitates considerably more sensitive focusing. Increased image contrast according to the latest research findings of Carl Zeiss In response to the extreme demands of advertising photography, for which Carl Zeiss is one of the leading optics suppliers, new methods and materials were developed to suppress stray light and to increase colour saturation. Purer, more intensive colours, especially at full aperture, were thereby achieved. An important criterion in the optical design was a high MTF value for the rendering of 10 line pairs/mm, a frequency range which is responsible especially for the crispness of the image. On all ULTRA PRIMES over 90 % MTF was attained for this spatial frequency. The extremely uniform brightness across the entire image area augments the impression of sharpness. Colour fringing is no longer perceivable. For the first time the ultra primes ? unlike other lenses ? were corrected not only for infinity, but also particularly for close-focus. The result: highest quality optical performance over the entire focus range. Unified Colour Characteristics: Super-Colour-Matched It goes without saying that the optical glasses were especially selected to ensure unified colour characteristics. As the inventor of optical anti-reflex coating, Carl Zeiss however augments this with a T* multiple-layer anti-reflex coating system for individual lens surfaces, which is adapted so that the colour characteristics (Color Contribution Indices) of all lenses of the entire set lie close together with very narrow tolerances. Put simply: the ULTRA PRIME lenses are super colour-matched.
Superior mechanics Precision focusing with constant optical length, without backlash. Iris and Focusing Rings without axial displacement Nine-bladed and ten-bladed irises
A Concept to meet today's demands Quick, sure and efficient operation is more important than ever for today's film productions. Lenses also play an important role in simplifying their tasks. Some advantages of the new lenses at a glance:
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