Which country are Carl Zeiss lenses made in? What's so good about them?

Carl Zeiss AG (Carl Zeiss) is a long-established German company that manufactures optical systems, industrial measuring instruments, and medical devices. The company takes its name from one of its founders, the German optician Carl Zeiss (1816-1888). Carl Zeiss began manufacturing scientific instruments in the southwestern German city of Jena, and its commercial activities began in earnest after 1866. A researcher at the time, Dr. Ernst Abbe, developed a theory of microscopic imaging that became the scientific foundation of the optical industry. Dr. Paul Rudolph, one of Abbe's assistants, developed a set of high-performance photographic lenses. As a result of these achievements, Carl Zeiss became the leading company in the field of optical instruments. Since then, along with highly achromatic lenses (1880s), aspherical mirrors (1930s), astronomical telescopes, binoculars, eyeglasses, surgical microscopes, the projector planetarium (1925), and other groundbreaking achievements, Carl Zeiss has been able to remain at the forefront of the optical instrument industry. Carl Zeiss was granted a patent in 1935 for an effective anti-reflective coating technology, the Carl Zeiss T*, which is considered one of the most significant inventions of the 20th century. Carl Zeiss AG was founded in Jena in 1846 by Carl Zeiss, Ernst Abbe and Otto Schott. Due to the Second World War, the original company was split into two parts. One was Carl Zeiss AG in Oberkochen, which had two important subsidiaries in G?ttingen Ahlen and Hallbergmoos. The other is Carl Zeiss GmbH in Jena. Carl Zeiss is the first constituent company of the Zeiss Group (Zeiss Gruppe) and one of the two largest components of the Carl Zeiss Foundation (Carl-Zeiss-Stiftung). The Zeiss Group is located in Heidenheim and Jena. The other constituent companies of the Carl Zeiss Foundation are the glass manufacturer SCHOTT GmbH and the Jena glassworks (Jenaer Glaswerk), located in Mainz and Jena, respectively. Today Carl Zeiss has grown to become Europe's largest optical instrument company with 14,000 employees, factories and subsidiaries in more than 20 countries including Japan and the USA. Carl Zeiss produces a large range of high-performance lenses. The lenses are used in a wide range of applications, including research, industry, imaging, aerospace and defense. Carl Zeiss is also used in style photography, cinematography (analog and digital), archival photography and quality inspection photography. Whether on earth or in outer space, in any environmental conditions, the best in design and performance. Classic Zeiss Optical Products Since the beginning of the twentieth century, Zeiss has developed several lens designs (ranging from wide-angle to telephoto), all of which are classic lens designs that have influenced the images of an era: Distagon: a reverse-focus, wide-angle lens design, mainly for use from 18mm to 35mm, featuring slight distortion and a high center of gravity resolution. Biogon: symmetrical design, dedicated to continuous rangefinder cameras, with average resolution, but with significant light loss. Hologon: Dedicated to ultra-wide-angle rangefinder cameras, but with more noticeable light loss than the Biogon, requiring correction with filters. Tessar: "Tessar lens", the standard lens design, mainly composed of four three-group lens, features: low distortion and thin. Planar: mainland China phonetic translation for the "Planar", for the standard wide-angle to 135mm in the telescope lens design, is a six-piece, four-group lens symmetrical Gaussian, initially only f/4.5. Today Planar lens has been made to f/1.4, Planer's characteristics are chromatic aberration correction, symmetrical design, very low distortion. Planer was designed by Paul Rudolph in 1896. Sonnar: Translated as "Sonnar" in mainland China, it is designed for medium-zoom (135mm) to long-zoom (250mm), featuring no spherical aberration, minimal loss of light, and deformation so low that it is unrecognizable to the naked eye, but dispersion has to be corrected by APO. Invented in [[1931]] by Zeiss optical designer Ludwig Jakob Beltre, the Vario-Sonner is a zoom design derived from the Sonner. Tele-Tessar: Designed for superzooms (250mm and above) derived from the Tessar, characterized by no spherical aberration, very low distortion, very slight light loss, and a very small lens composition, with a minimum lens count of 300mm F/2.8, and using only seven lenses. Mirotar: This is a reflex lens for super telephoto. There are 500mm f/8 for general photography and 500mm f/4.5 and 1000mm f/5.6 for space. Super Achromat: The best achromatic lens design available, used only on Hasselblad cameras. Mutar: 1.4x, 1.7x doublers for the Rolleiflex Twin Lens Reflex camera, Rollei 16 miniature camera, and currently only for Sony digital cameras. Mutargon: Reduction lenses (also known as wide-angle lenses), currently only used on Sony digital cameras. T* Coating: A multi-layer anti-reflective coating developed by ZEISS in collaboration with Rollei.