Proceedings Paper • newOptical technologies for extra-high zoom ratio UHDTV broadcast lens
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UHDTV has entered the practical stage, as exemplified by the start of 4K/8K satellite broadcasting in December 2018 in Japan. Advancements in broadcast television camera systems is remarkable with 2/3-inch tri-sensor cameras evolving from HDTV to 4K, while at the same time 4K optical performance has been achieved for the associated interchangeable lenses. A contemporary requirement for broadcast television lenses is extra high zoom ratios that offer dynamic and seamless moving image expression, while avoiding lens exchange during live productions such as sports broadcasts and concert stage performances.
In this paper, we introduce the optical design concept applied to the latest 2/3-inch 4K zoom lens having a higher than 80x zoom range. The paper will further explain how Canon has realized 4K optical performance – while maintaining physical size and zoom ratio equivalent to the latest HDTV lenses – by referring to patent-pending technologies encompassing optical power layout, lens construction, and glass material combinations.