Important Note: FULL MANUAL lens, NO Electronic Contacts, your camera will not detect the lens when mounted, that's why show lens not attached or not recognize, please set camera on M(MF) mode and then setting the "Release W/O Lens" option in the camera menu to "Enable" Long Distance Lens: As a telephoto lens, 500mm add a 2X Teleconverter doubles the power of your lens to 1000mm which can offering you the ability to capture crystal-clear long-distance visuals. Manual Focus Lens : Manual camera lenses cannot display the aperture value in the camera. Need adjusted to Shutter speed and ISO take a good photo. PACKAGE INCLUDED: OPTURA HD WHITE 500MM F/8.0 TELEPHOTO LENS + T-MOUNT + 2X TELECONVERTER + 67MM FILTER KIT + CLEANING KIT A Photographer's Essential Tool, High-power 500mm telephoto focal length, add 2X Teleconverter doubles the power of your lens to 1000mm.High index, Multi Coated Low-dispersion Glass imported , Filter thread: 67mm,Manual focusing telephoto lens can be used for DSLR/SLR/mirrorless cameras