The CJ25ex7.6B is the first 4K UHD broadcast lens in its class with a 25x optical zoom (190mm) on the telephoto end (380mm with the built-in 2x extender). Combined with a 7.6mm wide setting, the CJ25ex7.6B is ideal for a wide range of 4K UHD outside broadcast television productions including live sports, nature, concerts and other live events.
The CJ25ex7.6B 4K UHD broadcast lens was built using our exclusive optical design technology, helping ensure consistent 4K resolving power and high contrast from the center of the screen to the periphery, maintaining 4K optical performance even when the 2x extender is deployed. Zoom fluctuation is controlled through the use of a multi-group movable zoom and aspheric surfaces, and the use of a floating inner focus system helps minimize focus aberrations and improve resolving power at the edges of the screen.
A combination of latest materials, contemporary optical design and multi-layer coatings help produce outstanding 4K imagery, effectively allowing 4K cameras to reach their potential, and expand the possibilities for image expression. Design strategies and optical materials were utilized to help lower the monochromatic and the chromatic optical aberrations to a level consistent with the highest quality 4K portrayal on large screens.
Fluorite and UD glass have been generously utilized and optimally arranged for better correction of chromatic aberrations. This helps increase image clarity with less color bleeding or coloring around the outlines, achieving superb color reproduction to the edges of the images.
Special coatings and an internal lens barrel designed to prevent reflection, result in clean black reproduction and less ghosting and flaring- sustaining high-tonality images that support High Dynamic Range (HDR) and Wide Color Gamut (WCG).
HDR images offer excellent gradation representation and enhanced realism and dimension including texture for image representation close to the real thing. However, there can be noticeable color bleeding and flare, so HDR shooting requires high optical performance. The CJ25ex7.6B 4K UHD broadcast lens delivers the advanced optical performance that Canon considers essential for a 4K UHD/HDR system lens, enabling shooting of more realistic images.
The portable CJ25ex7.6B 4K UHD broadcast lens features correction data that supports BT.2020, which offers a wider color gamut than the conventional BT.709 broadcasting standard. This enables excellent color reproduction to the corners of the screen when attached to a 4K camera, producing images that support High Dynamic Range (HDR) and Wide Color Gamut (WCG). The CJ25ex7.6B also provides optimized chromatic aberration correction based on BT.2020 correction data, enabling more lifelike high-resolution images with outstanding tonality, realistic texture and depth.
The portable CJ25ex7.6B 4K UHD broadcast lens incorporates a digital drive unit, and the high-performance 16-bit encoder supports communication with compatible 2/3" HDTV/UHDTV cameras equipped with aberration correction functionality, without initializing the lens. Three 20-pin connectors enable high-definition lens output for virtual systems even during full-servo operation. In addition, the low power consumption and the simple display enhance operability.
The drive unit of the CJ25ex7.6B can output accurate lens position data from the moment the power is turned on and does not require initialization, contributing to the quick start when shooting. This is possible thanks to the drive unit's 16-bit absolute value encoder. Eliminating initialization of the encoder at power-on simplifies calibration when composing virtual and live-action images, and helps to create more accurate composites.
Aberration correction functions have increasingly been employed on 2/3" HDTV/UHDTV cameras for broadcast use. The associated data files are immediately transferred to the camera, which implements digital correction for the lens aberrations. The lens also delivers digital positional data for external virtual systems.
Various digital features can be set, adjusted, and operated from the display on the drive unit.
This feature allows for compatibility with a broadcast-use HD demand. It enables the use of the zoom and focus electrical drive system accessories, such as the new ZDJ-S01 Zoom Demand and the FDJ-S01 Focus Demand, which are currently used by HD equipment.