Here's why:
* Hardware Limitations: The R5 has a sensor with a native resolution of roughly 45 megapixels. While the camera can use pixel-shift technology to increase the resolution of the final image, it cannot reach 400MP without significant hardware upgrades.
* Current Pixel-Shift Capabilities: The R5 already has a pixel-shift multi-shooting mode. This mode shifts the sensor slightly between each of 9 exposures and combines them in post-processing using Canon's Digital Photo Professional software. This results in a higher-resolution image and improved color accuracy. The output resolution is around 180 megapixels.
* Beyond the Current Limits: Reaching 400 megapixels would require:
* Significantly more shifts and exposures.
* Extremely precise stabilization to prevent blurring during the multi-shot process.
* Much more powerful processing capabilities within the camera and in post-processing software.
* Immense data storage and processing requirements.
In short, a firmware update alone cannot overcome the fundamental hardware limitations of the existing sensor and processing power within the Canon EOS R5 to achieve 400-megapixel images. This would necessitate a new camera model with a completely redesigned sensor and supporting components.