Enhance your photography skills with the Bahtinov Mask for Canon EF 200 2.8L Lens Hood, or to fit Canon 100-400mm 4.5-5.56 L. This high-quality mask is designed to fit perfectly with your Canon EF 200mm lens, or fits Canon 100-400mm 4.5-5.56 L, providing a comfortable and secure fit. The mask is made by Spencer-3d, a reputable brand known for their exceptional quality products. This unit is perfect for anyone looking to improve their photography skills and take their pictures to the next level. The mask is easy to use and provides a clear view through the lens, allowing you to capture the perfect shot every time. With its compact and lightweight design, this Bahtinov Mask is a must-have accessory for any photography enthusiast.