Lightdow 420-800mm f/8.3 Manual Zoom Super Telephoto Lens + T-Mount for Canon EOS Rebel T3 T3i T4i T5 T5i T6 T6i T6s T7 T7i SL1 SL2 6D 7D 7D 60D 70D 77D 80D 5D II/III/IV DSLR Camera Lenses

* NOTE: This is a MANUAL lens, no electronic contacts, that's why your camera will not recognize the lens, it requires full manual settings on camera & lens body., please switch to MF MODE in order to use this lens correctly. Tips to use Manual Lens: 1) Set the mode dial to Manual (M); 2) Set the Release w/o Lens option in the camera menu to Enable; 3) Set the Shutter lock option in the camera menu to Off: no lens. * 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. * Multi coated low-dispersion glass, anti-reflection coating, manual focus telephoto zoom lens to use with DSLR SLR cameras. * A...