High quality optical H-K9L glass construction ensures superior clarity and durability for exceptional optical performance. Versatile wavelength range of 400-1100nm, ideal for various photography and optical experiments. Precise optical density range from 0.1 to 1.0 that allows accurate light control and exposure adjustment in your projects. Compact dimensions of 12.5 mm or 25 mm diameter and a size of 50 x 50 mm, perfect for installation in various optical structures and devices. Each filter is carefully crafted and has a wavefront transmission error of λ/4 at 633nm and a dimensional error of +0.0/-0.1mm for reliable and consistent results.
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