[Professional Manual Focus Experience] – Designed for photographers seeking ultimate control, the f/8.3 telephoto zoom lens features a fully manual focus system, requiring careful adjustment of shutter speed, ISO, and aperture. This process enhances skills and unlocks creative possibilities beyond conventional photography. [Super Telephoto Lens] – The 420-800mm f/8.3-16 full-frame zoom lens delivers precision manual focus with a large focus ring and internal focus mechanism. UMC technology minimizes aberrations and flare, producing sharp images with stunning background bokeh. The aperture adjusts automatically based on focal length (f/8.3 at 420mm, f/16 at 800mm). Compatible with 62mm filters and Canon EF/EF-S mount cameras. [Wide Compatibility] – The Lightdow 420-800mm f/8.3 telephoto lens works with Canon EOS Rebel SL3, SL2, SL1, T8i, T7i, T7, T6i, T6, T5i, T5, T4i, T3i, T3, T2i, T1i, and EOS 5D, 6D, 7D, 60D, 70D, 80D, 90D, 1D models. Ideal for portraits, landscapes, wildlife, and macro photography. This fully manual lens lacks electronic contacts, so cameras must be set to Manual (M) mode. Manual focus offers precise control, creative flexibility, durability, and adaptability, making it a reliable tool for specific photography needs. [Capture Stunning Details] – The 420-800mm telephoto lens brings distant subjects closer, perfect for moon, wildlife, birds, architecture, airplanes, and landscapes. Aperture range: f/8.3-16, automatically adjusting with zoom.