Sigma plans to launch three new RF mount lenses in February next year to lead changes in photography technology

News on November 30, it was recently revealed that Sigma plans to launch three new RF mount lenses in February next year, including two RF/RF-S mount zoom lenses and an RF/RF -S mount fixed focus lens. However, the specific information on whether these three lenses are full-frame or APS-C lenses has not yet been released

In September 2018, Canon launched the RF mount, which The inner diameter of the port is the same as the Canon EF mount, which is 54mm. The flange distance of the EOS R and EOS RP cameras is 20 mm, and the RF lens has 12 electronic contacts. Compared with the 8 electronic contacts of the EF lens, it increases the amount of data transmission, making the transmission between the body and the lens Faster

According to the editor’s understanding, in addition to the above news, CanonRumors also pointed out that Canon is expected to release an RF 400mm f/4 DO IS next year USM telephoto fixed focus lens, and this lens may adopt a new optical design. Prior to this, Canon had launched three "DO" brand lenses, all of which were suitable for the EF mount. The first one was the EF released in 2001 400mm f/4 DO IS USM, followed in 2004 by the more affordable zoom model EF 70-300mm f/4.5-5.6 DO IS USM.

In 2014, Canon released the EF 400mm f/4 DO IS USM II, which improved the contrast problems existing in the first version. All EFs currently launched by Canon All DO brand lenses have been discontinued.

According to CanonRumors, many years ago Canon showed off an EF 600mm f/4 DO IS that had never been launched. USM prototype. According to the latest news, Canon is developing a 600mm f/4 DO lens, but the specific release time is expected to be later than the RF 400mm f/4 DO IS USM.

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