★This is a full manual lens, your camera will not detect the lens when mounted, that's why it shows "Lens Not Attached", please switch to MF MODE in order to use this lens correctly. Before use, pls lock the"Lock-Open" ring on the lens of body .Tips to use: 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. | ★ About picture are too dark or white，Pls set camera shutter speed or ISO resolve.（If mage white:Set more fast shutter speed,1/100s to 1/250s to 1/500s....,Until the picture is normal If image dark:Set lower shutter speed,1/500s to 1/250s to 1/100s...Until the picture is normal) and use with a tripod and remote to keep image stable. | [Premium Quality] JINTU 420-800mm MF Super HD Telephoto lens, Solid Construction with Brass and Aluminum, Small size 10.6 x 3.5 x 3.5 inch, lightweight 500g=1.1LB, easy to carry to anywhere. | 2 years warranty. High index, low-dispersion multi-coated optical glass to reduce flare,Filter thread is 67mm. | [Compatible Device] Compatible with Sony e mount Digital Mirrorless Cameras A7,A7R,A7II,A7III,A7S,A7M2,a3000, a5000, a6000, a3500, a5100, aQX1, PXW-FS7 NEX-3, NEX-5, NEX-C3, NEX-5N, NEX-7, NEX-F3, NEX-5R, ,NEX-6 , Perfect for landscape, portraits, still life, traveling, wedding and wildlife photography.