with 3 side flaps or not at different dimensions.Specifications as follows:
1.Material:optical PMMA or equivalent
2.Diameter:25mm,34mm,37mm or as request
3.Focal length:45mm
4.center thickness:5mm or as request
5.Dimension tolerance: ± 0.1mm
6.Tolerance Center thickness: ± 0.1mm
7.Paraxial focal length: ± 2%
8.Transmission:93%
Any other dimensions is available,we can custom the lenses as per your request.Welcome inquiry.