It holds the film flat even when the film has been deformed by sitting loaded in the camera for a period of time. The RTV system appears to be most useful in overcoming a design flaw in 35mm film cartridges.
When you depress the exposure release button half way, the camera sucks the film against the pressure place to insure extreme film flatness. The RTV system works by combining an electromagnetically controlled suction device with a ceramic film pressure plate. One has to admit that this concept and its execution are fascinating. One feature of the RTSIII that Contax liked to mention first in its marketing materials is the Real Time Vacuum ("RTV") mechanism, which holds the film perfectly flat in the camera during exposure. In the following article, I will describe the RTSIII in detail, including its strengths and weaknesses as a pro-level film SLR. Alternatively, if you are looking for a high-end Contax film SLR that is of similar quality and technological level as the RTSIII, but is also more mobile, for travel or other use, the RX and RXII are recommended. Thus, the RTSIII is designed for no-compromise professional shooting.
Of course, you need to add the considerable weight of the batteries and whatever all metal and glass Carl Zeiss lenses you need in your bag. The RTSIII, at 1,150g, has similar size and weight as the F4 (1,090g) and F4s (1,280g) and is just slightly lighter than the integrated Nikon F5 (1,210g). Regardless, the fabrication materials, as well as the fit and finish, of the RTSIII appear even slightly superior to the F4. Contax did not adopt autofocus in their film SLRs until the AX (with manual focus lenses!) and the last generation N1/NX series.
Of course, unlike the early generation autofocus F4, the Contax RTSIII is still manual focus. The RTSIII is more or less comparable with the F4 in the Nikon world, although the two cameras had very different design philosophies. This is the ultimate Contax camera to use when shooting film and Contax/Yashica Mount Carl Zeiss glass. The camera is all metal and built with a beautiful matte black finish. The RTSIII, compared with the RTS and RTSII, was built with the relatively more modern technology of the early 1990s, and is fabulous in every detail. The RTSIII, and its older siblings, as well, are fabulously designed and built machines. The RTSIII was the third and final member of the RTS series, and was preceded by the RTS in 1974 and the RTSII in 1982.
It was designed for professionals and serious amateurs. The Contax RTSIII, originally released in 1990, was the final top-of-the-line Contax pro-level 35mm manual focus film SLR body. Contax RTS III with Carl Zeiss Planar 50mm f/1.4 (MMJ)
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