Duplicating film is one of the finest film and are well known around the world for their superior ability to capture the best contrasts and finest details. All duplicating films are supplied as transparency material.
The advantages of this film are that they possess low contrast, exceptional grain structure, and wider-than-normal exposure latitude. However, there is also some down side as they are very slow, rated at about ISO 12 or even lower.
When making high-quality duplicates, be aware that exact reproduction of an original is just about impossible. However, excellent duplicates that are even improved versions are not too difficult to manage. And another good thing about it is you don't need sophisticated equipment, either. The actual procedures is slightly complicated, but if you have some means to make 1:1 or greater magnification images and a 3200K light source, you should be able to make good dupes. Granted, higher tech solutions are available; however, they will not always ensure better results.
It is quite hard to find the films on the market nowadays but there use to be four duplicate films that can be commonly found in the market. Three are made by Kodak and one by Fuji. Kodak films differ from one another in several ways. Ektachrome Type 5071 is a film intended to be exposed under tungsten light, and its sibling, Type SO-366, is daylight-balanced. In most other ways the two films are alike. Kodak also makes a duplicating film, Type 8071, specifically intended to duplicate Kodachrome originals. This film has been found a necessity in dealing with the image-forming dyes used in Kodachrome, dyes very different from those used in Ektachrome and similar E-6 films. Essentially, Type 8071 duplicating film closely matches the spectral response of Kodachrome originals. When duplicating other makes of film, such as Agfa, Konica, Polaroid, or Scotch, a duping film intended for E-6 films is preferable to Type 8071. Fuji Film also offers a slide duplicating film, Type CDU. This emulsion is an E-6 film for use under tungsten illumination, and has an extended slow exposure time tolerance reaching all the way down to twenty seconds. Fuji Film originals and CDU are perfectly matched to one another but any other E-6 film original can be successfully reproduced with this film.
As with all other duplicating films, use of an ultraviolet-absorbing filter, such as Wratten 2B, is strongly advised. Like its Kodak counterpart, Type 5071, Fuji CDU produces excellent quality duplicates, featuring high definition and excellent color purity.
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