The Voigtländer VSL is a series of 35mm SLR bodies manufactured by Rollei in the 1970s and 1980s under the brand name Voigtländer. The name belonged to Zeiss before the demise of Zeiss Ikon in 1972, then was taken over by Rollei.
Screw mount models
Rollei continued the production of the last 35mm SLR developed by Zeiss Ikon, the SL706 and named it Voigtländer VSL 1. It could accept 42mm screw lenses and is today called the VSL 1 (TM) to distinguish it from its follower. It existed in chrome and black.
The production was delocalized to Singapore. Only 500 VSL 1 bodies were built in Germany, all the later cameras were assembled in Singapore. The rumor says that the quality control in the Singapore plant was poor at the beginning, but that the situation improved with the years.
There was a name variant of the VSL 1 called the Ifbaflex M102, made for a French distributor with an Ifbagon 1.8/50 standard lens (a rebadged Planar 1.8/50). It only existed in chrome finish, and was built in Germany.
At about the same time, a prototype called the VSL 2 CX automatic was developed, based on the Chinon CE Memotron. It had automatic exposure and 42mm screw lenses. It only existed in very small quantities, and was never released on the marketplace. The only picture I know is here.
Bayonet mount models
The VSL 1 (TM) was a concurrent of Rollei's 35mm SLR, the Rolleiflex SL35 and SL350, which used the Rolleiflex SL35 lenses. This situation was absurd, and it ended in 1976. Rollei abandoned the development of the SL35 and SL350, and decided instead to concentrate on the VSL design. So they launched a variant of the VSL 1 with the SL35 bayonet mount. It was also named VSL 1, and is today called the VSL 1 (BM). It only existed in black. The Rolleiflex SL35M was the same body with modified cosmetics.
In 1976 was developed a version with aperture priority automation, called the VSL 2 automatic. The shutter speed selected by the meter was indicated in the finder by a needle. The VSL 2 automatic was sold together with the VSL 1 (BM). It only existed in black. Its Rollei equivalent was the Rolleiflex SL35ME.
The next generation came at the end of 1977 with the VSL 3-E, the last Voigtländer body to be designed in Germany. It had an all-new electronic vertically running focal plane shutter, with flash sync at 1/125, and a SiO2 meter with aperture priority or manual exposure. The shutter speed was indicated by LEDs in the finder. It could also accept an external winder or motor drive. It was sold in chrome or black. Its Rollei equivalent was the Rolleiflex SL35E.
The Vitoflex E existed in prototype form only. I have heard two different stories. One story tells that it was an equivalent of the Rolleiflex SL35 OE Dual, with both aperture priority and shutter priority modes. Another story tells that it was only the name of the pre-release version of the VSL 3-E, with a shutter going to 1/2000. The name was changed before the release because it was too close to Visoflex patented by Leica. The last story is more probable, and is supported by the pictures shown here.
In 1981 Rollei went bankrupt. They had to close the Singapore plant, ceased the production of middle-range 35mm SLRs to concentrate on the high end Rolleiflex SL2000F, and stopped using the Voigtländer name.