300mm aspherical optical lens
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600w Mono light Photography Studio Strobe Flash Lighting Accessories Standard Reflector Mirror
Specification MaterialsBK7 or others optical glass. quartz. sapphire . Ge. Si- ZnSe· CaF2 etc.Diameter1.5~300mmRadiusR 0.8mm-∞Focal length-30000mm~+ 30000mmCenter thickness tolerance+/-0.01mmDiameter tolerance+/-0.005mmFocal length tolerance+/-1%Surface accuracyN=1~3IrregularityΔN=0.1~0.5Decenter3"...