... committed to designing and making all kinds of optical components for customer special use MaterialBK7 etc optical glass to IR CaF2 ... ZnS,quartz, Sapphire,etc crystal materials. SizeΦ2 –Φ120mmDimension tolerance± 0.1mmSurface quality10/5,20/10,40/20, 60/40,80 ... @ 632.8nm,Parallelism5 arc minutesClear aperture> 90%Edges Ground, Maximum 0.25mm Edge ChipCoatingUncoated, AR, HR, PR coating, etc. Appearance ...