900mm f/8.0 telephoto mirror lens The telescopic mirror lens is a light and compact telephoto lens. The lens has an advanced mirror design, small size and aluminum alloy structure which makes it light and durable. This lens can be used for aperture priority and manual exposure adjustment. A very good magnification can be achieved with the folding lens. Focusing is done manually. Due to its simple operation, this lens is also particularly suitable for beginners. This foldable telephoto SLR camera has a ring lens as the front lens and a reflective device in the middle. The greatest imaging feature of the reentrant lens is the ring-shaped defocusing to the outside due to the special optical structure. The result of the imaging is many "donuts". (see sample photo) This lens is widely used in photographic devices such as birds, sports, and wildlife. Compatible with: The lens is included a T2 mount adapter ring,compatible with most DSLR Camera. If you are not sure if the lens is suitable for your camera,please contact us for confirm! FAQ 1. Q: Why does my camera say "Lens not attached" or can't connect or not recognized? A: This is a full manual focus lens, no electric contacts, your camera will not detect the lens when mounted, pls switch camera dial mode to M mode to work. 2. Q: I can't press the shutter button when lens mounted, why? A: Normally switch your camera to M mode will solve this issue, for some cameras, you need to setting "Release W/O Lens " to Enable on camera menu to make lens work. 3. Q: Image are too dark/ too white? A: if picture is black , pls setting more slower shutter speed. such as 1/500 seconds to 1/400 seconds until image normal. if image is white, pls increase shutter speed more faster, such as 1/500 seconds to 1/800 to 1/1000 seconds until image normal. 4. Q: Why is my picture out of focus? A: Pls rotate the focus ring on the front body of the lens until the subject is in focus, and focus with live-view to achieve accurate focus. Recommend use with a tripod and remote to keep image stable

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