Lightdow Telephoto Zoom Lens 420-800mm f/8.3-16 SLR Lenses Manual Zoom EF Lens

This is a FULL Manual Lens, NO Electronic Contacts, your camera will not detect the lens when mounted, that’s why it will show “Lens nont attached”. Please switch to MF MODE in order to use this lens correctly. Tips to use our Manual Lens: 1) Attach the lenses with T-ring adaper; 2) Set the mode dial to Manual (M)
Fine tune the front focusing ring to make subject in-focus and take a sample picture. If the picture turns out dark, take the following steps to improve, 1. Lower the shutter speed, from 1/500s down to 1/100s or slower 1/50 etc; 2. Raise the ISO Number, from ISO 100 to ISO 200/400/800 etc; 3. Use a remote shutter release and tripod to increase image stability; 4. Switch position to allow more environmental light coming through the lens into the camera imaging sensor.