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日期:2024-07-31
Ball Lens Features Uniformly and Precisely Ground Excellent Surface Roughness Higher Sphericity (...
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日期:2024-07-27
The place to buy cutom and stock ball lenses including sapphire, knight optical, drum and ruby ball lenses. ... Ball Lens Calculations Effective Focal Length (EFL) of a ball lens: BFL=EFL-D/2 Where, EFL= nD/4(n-1) BFL is Back Focal Length n is refractive...