The folding cameras from Boyer are easily identifiable, as the name of the Parisian optician is engraved on the base of the lens mount, and their stand bears a "B." The optician is not the manufacturer of these cameras. It is Lemaire.

The Boyer Pax shares the same qualities and construction characteristics as the Lemaire models, including a mechanically crafted body made of aluminum alloy, covered with a black grainy leatherette; film spool holders with quick-release axes; the same distinctive scissors; lens mount with corner locking; circular distance scale at the front of the folding bed with its lever; the pivoting viewfinder rectifier, providing automatically the correct framing; and the iconometer viewfinder.

The Pax is available in both 6 x 9 and 6.5 x 11 formats, with numerous combinations of lens and shutter.
The Pax can be equipped with a back for 6.5 x 9 cm plates, and its lens mount, sliding in its support, can be vertically shifted by 25 mm.

The Boyer Pax 6.5 x 11 was priced at 650 Francs in the Photo-Plait catalog of that time.

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En 1847, Mr. Lemaire founded a company with just one worker, which would later become the Lemaire Binoculars Manufacture, and then the Baille-Lemaire and Sons Establishments. In 1861, Mr. Lemaire established a training school and a boarding school for apprentices. In 1865, he created a mutual aid fund. In 1869, he introduced a attendance bonus. In 1870, Jean-Baptistin Baille (1841-1918), a graduate of the École Polytechnique, friend of Zola and Cézanne, married Armande Louise, Mr. Lemaire's daughter, and in 1871 became the co-director. Mr. Lemaire passed away in 1881. Jean-Baptistin Baille took over the management of the factory in 1885. The factory was then named Lemaire-Baille. On many patents filed by the company, Jean Louis Baille, the son of Jean-Baptistin, is presented as the inventor of the patented product.

Lemaire produced some fine models of cameras with innovative technical features protected by patents.

The following patents all list Jean Louis Baille (26 Oberkampf Street, Paris) as the inventor and Baille-Lemaire and Sons as the applicant.

Patent No. 543,909, filed on November 25, 1921, for improvements made to the focusing devices of cameras.
Patent No. 1,481,673, filed on February 6, 1922, for a combined roll-holding and plate camera	Patent No. 1,512,664, filed on October 30, 1922, for System of braces for supporting the folding beds of folding cameras
Patent No. 1,528,239, filed on October 30, 1922, for Supporting device for objectives of photographic apparatus	Patent No. 1,544,794, filed on October 30, 1922, for Distance-indicating device for the focusing of photographic apparatus
Patent No. 1,579,345, filed on February 6, 1923, for Plate-carrying frame for photographic apparatus

En 1911, there is also a patent (No. 421 0235) for an adjustment method and device for rangefinders filed by the company Baille-Lemaire and Sons, with no inventor mentioned. In 1912, there are other patents for a Sitomicrometer with self-collimating prisms (No. 443 041) or for an optical system with multiple magnifications and automatic focus retention (No. 445 333), etc. Patent filings cease during the First World War and only resume in 1920. The filings definitively stop in 1923.

Despite a rich history, Lemaire is somewhat unknown as a camera manufacturer. Perhaps this is due to the absorption of the company by Boyer, the optician who incorporated the cameras under his own brand.