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Samyang 14mm T3.1 VDSLR ED AS IF UMC II is carefully designed for professional film and video works, so the focus gear ring is installed to follow the focus system. You may change the aperture quietly and smoothly with the uncoupled aperture gear ring. The T number guiding the amount of light transmission and distance scales are marked on both sides of the lens to film much more precisely. The lens operates in a manual aperture system with a low T-Stop, enabling natural shooting under various light exposure circumstances.