... lens,optical grating,optical windows,optical mirror,optical components,camera lens,fisheye lens,wide angle lens,telephoto lens,projector lens,adapter ring,adapter tube,custom lens,OEM etc.. Specification of our optical lens as ... follow: *Material BK7 or other optical materials *Dimension Tolerance +0.0 -- -0.1mm *Center Thickness +/-0.1mm *Focal Length Tolerance+/-1 ...