Color Balance All the lenses in the lineup are designed to comply with SIGMA's CCI standard simplifying when intercutting between lenses. Dust-Proof and Splash-Proof Design Sharing the same dust-proof and splash-proof construction as the SIGMA 150-600mm F5-6.3 DG OS HSM|Sports, each ring and mount is sealed to prevent water and dust from entering. All Metal Body Construction The lens body is made completely of metal to stand up to the rigors of the production day. Lens Markings The main lens markings are in luminous paint for easy visibility in low-light situations. The intermediate markings are laser-engraved for durability. The focus and zoom markings are readable from either side of the lens. Lens Front The lens features a 95mm front diameter for compatibility with a wide variety of matte boxes and incorporates an 82mm front filter thread. Lens Gears All three lens gears are standard 0.8 MOD and feature a damper that eliminates metallic sounds when you reach the end of the lens travel.