Round glass magnifier

magnifier(round): 1)Material:H-K9L 2)Opticalhomogeneity:2 3)Birefringence:3 4)Coefficientoflightabsorption:3 5)Fringeclasses:1C 6)Bubbleclasses(q):3C 7)Diameter:Φ25.2mm±0.04 8)Centrethickness(t):1.25mm±0.03 9)Edgethickness(d):1.00mm 10)Focallength(f'): 12)Curvatureradius(R):R1=30mmR2=∞ 13)Smoothfinish(B): 14)Clearaperture(N): 15)Irregularaperture(ΔN): 16)Centeringerror(C):0.05 17)Effectiveaperture(D0): 18)chamfer: 19)Metallic-membraneplating:none,but available 20)Magnification:3× If youare interested inour lens,please don't hesitate to contact us.It' s a great pleasure to establish a happy and successful business relationship with you in a long term.We believe that through our effort,we'll become your reliable supplier and best cooperator of your business.