In our quest to find the best telephoto lens, we recently had the opportunity to test the Canon RF100-400mm F5.6-8 IS USM, and the experience has been nothing short of impressive. This compact, lightweight lens offers remarkable versatility, making it an excellent choice for wildlife photography and sports events alike. We found the autofocus to be swift and precise, which allowed us to capture fast-moving subjects with ease. The image stabilization feature also proved invaluable, enabling us to shoot at lower shutter speeds without compromising sharpness. While the f/5.6-8 aperture may not rival some higher-end models in low light, it's a fair trade-off for the lens's portability and performance. Overall, we believe the Canon RF100-400mm is a formidable addition to any photographer's kit.