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Premium H-K9L optical glass construction ensures superior clarity and minimal distortion for professional-grade image . Versatile application wavelength range of 400-1100nm, making it ideal for various photography and optical experiments. Precision-engineered with a wavefront transmission error of λ/4@633 nm for exceptional optical performance. Available in multiple sizes (12.5mm, 25mm, and 50x50mm) to suit a wide range of optical setups and needs. Each filter is packaged individually, ensuring protection and ease of use for photographers and optical enthusiasts alike.