- WARM TIPS: Designed for Canon EF/EF-S DSLR cameras, this manual full-frame lens has no electronic contacts. To use it effectively, switch your camera to Manual (M) mode. For best results, attach the lens using a T-ring adapter, then set the mode selector to Manual (M). - Full Manual Focus Operation: This lens requires complete manual focus adjustment, which is ideal for experienced photographers. Take your time to rotate the focus ring to achieve sharp images, making it essential for those who understand ISO and shutter speed settings. - Exceptional Detail Capture: With a focal length of 420-800mm, this telephoto lens excels at capturing detailed images of distant subjects. Perfect for photographing moons, wildlife, birds, architecture, airplanes, landscapes, and more, it brings closer the elements of the world that inspire your creativity. - Adjustable Aperture Range: The lens features an aperture range of F8.3-16, which changes automatically with the zoom. Note that the aperture is not adjustable via the camera, resulting in readings of F00/F--. - Wide Compatibility: This EF/EF-S mount lens is compatible with a variety of Canon EOS models, including EOS Rebel SL3, SL2, T8i, T7, T7i, T6 series, 850D, 800D, 760D, 750D, 700D, and more. It fits a wide range of DSLRs, making it a versatile addition to your photography gear. - Application Scenarios: Use this lens for wildlife photography to maintain a safe distance from animals while capturing stunning detail. It is also ideal for astrophotography, enabling you to photograph the moon and stars clearly. Additionally, it can be utilized for portrait photography when you want to isolate subjects against a beautifully blurred background.