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4.0mm Diameter, Ruby Ball Lens

4.0mm Diameter, Sapphire Ball Lens

4.0mm Diameter, Sapphire Half-Ball Lens

4.0mm Diameter, Ruby Half-Ball Lens

4mm Diameter, Extended B270 Half-Ball Lens

4mm Diameter, Truncated B270 Half-Ball Lens

4mm Diameter B270 Half-Ball Lens

4.0mm Diameter, N-BK7 Ball Lens

4.0mm Dia. x 10.0mm FL, Uncoated, Plano-Convex Lens

4.0mm Dia. x 8.0mm FL, Uncoated, Plano-Convex Lens

4.0mm Dia. x 12.0mm FL, Uncoated, Plano-Convex Lens

4.0mm Diameter x 8.0mm Length, N-BK7 Rod Lens

4.0mm Dia. x 4.0mm FL, Uncoated, Plano-Convex Lens

4.0mm Diameter, Fused Silica Ball Lens

4.0mm Dia. x 6.0mm FL, Uncoated, Plano-Convex Lens

4.0mm Diameter, N-BK7 Half-Ball Lens

4.0mm Dia. x 12.0mm FL, MgF 2 Coated, Plano-Convex Lens

4.0mm Dia. x 10.0mm FL, MgF 2 Coated, Plano-Convex Lens

4.0mm Dia. x 8.0mm FL, MgF 2 Coated, Plano-Convex Lens

4.0mm Dia. x 6.0mm FL, MgF 2 Coated, Plano-Convex Lens

4.0mm Diameter, Fused Silica Half-Ball Lens

4mm Dia., 1mm Thick, Uncoated λ/4 N-BK7 Window

4.0mm Dia. x 4.0mm FL, MgF 2 Coated, Plano-Convex Lens

4.0mm Dia. x 8.0mm FL, NIR I Coated, Plano-Convex Lens