H-K9L premium optical glass construction ensures exceptional clarity and minimal distortion for superior image. Available in various sizes (12.5mm, 25mm and 50x50mm) to suit various optical and photography applications. The optical density range of 0.1 to 1.0 allows precise light control, making it ideal for long exposure photographs and for reducing glare. Designed for a wide range of application wavelengths of 400-1100nm, for both visible and near-infrared light filtering. Each filter is meticulously crafted with a wavefront transmission error of λ/4@633nm and a dimensional error of +0.0/-0.1mm for consistent performance.
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