The tamron 18 200mm f35 63 di iii vc lens for sony e mount cameras silver made for the sony e mount camera system incorporates a stepping motor that is optimal for the contrast detection af system of sony mirrorless interchangeable lens cameras this will also improve af when shooting video with the motor built into the lens focusing will be quieter and more responsive the 18 200mm f35 63 di iii vc is a high power zoom lens designed exclusively for digital slr cameras using the more co