Schneider Cinefilter Close Up Diopter Split +1. Split Diopters are used to increase the minimum working distance enabling closer focus from a greater working distance on half of the frame. These special diopters differ from traditional diopters because the single diopter element is precision cut in half and mounted in the ring. The result is half the image is magnified and the other half is untouched. Split Diopters are perfect for scenes where half the frame requires close focus and the other half requires distance focus while keeping all points in-between sharp.
Generally, diopters are lens attachments that shorten the close focus distance of lenses by reducing the focal length of the optical system.
Their strength is given as reciprocal of focal length in meter (so called diopter), e.g.:
- + 1 diopter = 1 meter infinity focus plane
- + 2 diopter = 0.5 meter infinity focus plane
Schneider-Kreuznach offer three different types of diopters:
Diopter Full
Classic full diopters reduce the close focus distance and even allow you to take macro images without using a dedicated macro lens.
Diopter Split
A split diopter is a standard diopter element which is precision-cut in half and mounted in a ring. It allows you to focus both fore- and background at the same time. Hence, it can attract the viewer's attention to an object in the back while the main scene remains focused.
Diopter Spot
Basically, a spot diopter is a classic diopter with a plain, polished area in its center. This leads to a sharp image in the middle and an out-of-focus area towards the edges. For dreamy images with an in-focus center.
The Schneider Group specializes in developing and producing high-Performance lenses for film and photo, cinema projection lenses, as well as industrial optics and precision mechanics. 1913 founded in Bad Kreuznach, Germany, as a mechanical shop for optical lenses, Jos. Schneider Optische Werke GmbH is today a worldwide market leader in high-quality lenses and precision engineering.