... x 45°)<0.25mmCoatingUncoated, AR, HR, etc.Note for sapphire window:(1). Custom-made sapphire windows at any size from Φ1 ... .0mm to Φ250mm clear aperture are available.Besides round, sapphire windows at shape of recangular, wedge, step windows or ... .Worldhawk offers standard and high precision optical glass windows in round, rectangular and custom shape and size with different optical glasses ...