Tell us about SIGMA, a Japanese camera manufacturer.

Sigma Co., Ltd. was established in 196 1 year, and is a professional manufacturer of interchangeable lenses for 135 cameras, which is 1 year later than the famous professional lens manufacturers Longteng and Tuli Co., Ltd. At that time, Japan's camera manufacturing industry was in the stage of vigorous development and catching up with West Germany since the war, so Nikon, Canon and Pantek, three famous camera factories at that time, each had a considerable series of high-quality lenses of their own cameras, plus the lenses produced by the two famous professional lens companies mentioned above. It has formed a kind of "high pressure" for Sigma. Mr. Daohong Yamaki is an outstanding founder of Sigma Company, an excellent optical technology expert, and the president of enterprise management who is proficient in production and sales (because of his achievements, contributions and fame in the optical lens manufacturing industry, he later served as the president of Japan Photographic Equipment Chamber of Commerce "JPEA". This alone shows that Sima plays an important role in the research and development of photographic lenses and knows how to survive in adversity. At the beginning of the company's establishment, it aimed at high technology and learned from others, but it did not follow the footsteps of others and won the reputation in the market with excellent products.

At present, Sigma is undoubtedly the largest vice factory director manufacturer. Both Longteng and Tully are left behind, but I personally like the shot of Longteng. Sigma's optics are good, that is, everyone says that the profit effect is the best. As a user who wants to achieve the same focal length and aperture without using the original lens, Sigma's deputy factory head is a good choice, but at present, Sigma's lens is relatively more selective. The lens is no exception.