appears when the shutter button was pressed halfway 
200 IS specifications
The Canon RF 200mm f/2L IS USM is a powerhouse telephoto lens that represents a remarkable advancement in Canon's lens lineup. Designed for the RF camera system, this lens is built to deliver exceptional image quality, stunning sharpness, and outstanding low-light performance, making it an invaluable tool for professional photographers and enthusiasts alike.One of the standout features of the RF 200mm f/2L is its large maximum aperture of f/2. This enables extraordinary subject isolation through creamy bokeh, allowing photographers to create images with depth and dimension. The fast aperture also proves advantageous in low-light conditions, allowing for faster shutter speeds without sacrificing image quality.
The lens incorporates Canon's advanced image stabilization (IS) technology, which provides up to five stops of compensation against camera shake. This feature is particularly beneficial for handheld shooting, making it easier to achieve sharp images even at slower shutter speeds. The combination of IS with the f/2 aperture also allows for handheld shooting in challenging lighting conditions, expanding creative opportunities for photographers.
The RF 200mm f/2L is constructed with Canon's L-series hallmark, which ensures durability and weather resistance. This rugged design allows it to withstand challenging shooting environments, making it ideal for wildlife and sports photography where conditions can be unpredictable.
Optically, the lens features advanced multi-coating techniques to minimize flare and ghosting while enhancing contrast and overall image quality. With 9 rounded aperture blades, the lens produces aesthetically pleasing out-of-focus areas, contributing to its appeal for portrait and nature photographers.
Thanks to the Canon RF mount's innovative design, the lens benefits from a high-speed communication between the lens and camera body, facilitating fast and accurate autofocus operations. The lens utilizes a Dual Nano USM (Ultrasonic Motor), which provides rapid and silent focusing, a crucial aspect when shooting in sensitive environments.
In conclusion, the Canon RF 200mm f/2L IS USM stands out for its exceptional image quality, fast and accurate autofocus, and robust construction. With the ability to deliver stunning images in a variety of conditions, this lens is a formidable tool for photographers looking to elevate their craft. Whether used for portraits, wildlife, or sports photography, the RF 200mm f/2L will undoubtedly serve as an essential component of any serious photographer's toolkit.