✿ 【FULL MANUAL FOCUSING】 -Manual adjustment, all metal structure, multi‑layer MC coating of optical glass, good light transmittance. ✿ 【T2 MOUNT】 -Widely usage, lens itself for T2 mount, can installed on telescope to observe moon, through standard adapter ring, can installed for EF-S mount camera for shooting far distance objects. ✿ 【2X MAGNIFICATION LENS】 -The lens has 420‑800MM super telephoto zoom, if matching 2X magnification mirror, focal distance range become 840‑1600mm. 2X magnification lens can double the focal length or magnification. ✿ 【APPLICATION】 -Telephoto lenses good for shooting distant scenery, wildlife, concerts, bird observation, etc. ✿ 【SERVICE】 -If you are not satisfied with the product, or if the product is defective or damaged, we will refund or replace the whole product. Please rest assured to buy!