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4.6 · Catalog note

E-37-435 40mm Dia., 0.80 Numerical Aperture, Uncoated, Precision Aspheric Lens Fusion Protection Sleeves Endoscopes became practical in 1956

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Description

Endoscopes became practical in 1956 when a college undergraduate discovered how to make solid glass fibers with a glass cladding

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E-37-435 40mm Dia., 0.80 Numerical Aperture, Uncoated, Precision Aspheric Lens Fusion Protection Sleeves Endoscopes became practical in 1956E 37435 40mm Dia., 0. 80 Numerical Aperture, Uncoated, Precision Aspheric Lens Diameter (mm): 40. 00 +0. 00 0. 025 Effective Focal Length EFL (mm): 25. 00 @ 587. 6nm Numerical Aperture NA: 0. 80 Back Focal Length BFL (mm): 17. 74 Substrate: N SF6 Aspheric Design Wavelength (nm): 587. 6 Coating: Uncoated Centering (arcmin): <3 Surface Quality: 40 20 Clear Aperture CA (mm): 36. 00 Edge Thickness ET (mm): 2. 40 Center Thickness CT (mm): 13. 10 0. 10 f #:

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